How To Test Ac Clutch Cycling Switch

My AC would randomly start and stop intermittently, so I ensured that the system was charged and once I was assured that it was full I checked this switch and it was the culprit. Which wires do you jump around to get current to the clutch so I can add enough freon to get the low pressure switch to allow current to the clutch?. Learn More. I found out how to test the A/C Clutch Cycling Pressure Switch , long story short its not working. The cycle switch is almost always on or near the accumulator (large can). the diode reads 3. That some how the internal (in the power distribution box) jumper to pin 3 (switch leg) on relay # 23 (fan clutch relay) to fuse 30 has become disconnected. For instance, a leak in the system allows the refrigerant to escape. It also does seem to be drawing load in that the rpm's and engine noise changed when the AC button is pressed. I assume the high pressure switch is the three wire plug near the fill valve? If so, what wires should I check or shor. The most important are the high and low pressure switches. 46 and they sell it for 26. Take off your coin Compartment it's right R2. 2 wires go to a temperature probe that goes in a pocket on the outside of the freon return line to the compressor. The first test should be to check the pressure in the system. Check out our options and find the part you need for your car, truck, or SUV. It is not low on Freon as I can hear Freon being released when pressing the valves in. It's important to replace the old tube with the correct one. Please note that this switch has a square connector, for 1998-1997 there is another switch that has a oval connector. Global Parts Distributors, L. If no click, check for power at the green wire at the compressor. Before testing the operation of the air conditioning system, make the following checks: 1. Pressure switches are commonly tripped by occurrences like clogged vents or hoses, dirty filters or condenser coils. i then checked the pressure with the car off and it was at about 100 psi. Jumping the pressure cycling switch is common practice on domestic CCOT systems, but the Civic is temperature cycled and fully controlled by the ECM. You can try a jumper wire at the compressor clutch relay socket (jumper the contact terminals only, NOT the coil terminals) or you can jump power directly to the clutch coil to verify compressor. I have electrical problem: the clutch won't engage on my Jeep Cherokee Laredo 92. Commonly the spec is 28-31psi. When you turn the knob to AC theres usually a click and then the pull on the motor as the compressor kicks in. the pcm monitors many other componets when out of range this will prevent ac clutch from. I did that to mine while I was replacing all the o-rings in the system. Automotive Air conditioning: how it works. Find Ac Compressor Bearings in stock and ready for shipping here! Parts Supply Online Shop. Most imports utilize a high pressure switch to cycle the fan On smaller such vehicles a WOT Wide Open Throttle or low vacuum switch is employed ANd if you really want to get crazy Ford uses a Power Steering switch to save power and cut the compressor when theres a demand for power steering. I decided not to have it reapied there and they wouldn't tell me exactly what needed to be done. There are two basic types of automotive air conditioning systems. A/C-heater system is a blend-air system. A/C Clutch Cycle Switch - ([A/C Clutch Cycle Switch] TO ACCUM, BLACK; Quantity needed per vehicle: 1). If you need a replacement part, O'Reilly Auto Parts has a selection of switches, including an A/C clutch cycling switch, available for most models. If you are seeking top-quality and affordable air conditioning parts for your vehicle, then UAC products offered at CARiD are what the doctor ordered. Doing so saves your compressor from damage. Using a multimeter, check resistance between Figure 1-2. As your question, I jumped from negative bettery to one of teminal AC pressure switch, I'm not sure what number it is. Is possible that a bad Diode could stop the A/C from working? And is there a way to test it? 2002 Venture 104,000km No way. If you jump the low pressure switch with the engine running, do it only for a few seconds. Don't confuse this with flex in the blade. It doesn't vary or change its output according to demands like an expansion valve does. It will only allow you to engage th ac compressor clutch. Turning off the AC and then back on has resolved the problem in both cases. The cycling switch screws to the top of the accumulator / drier. Before you start troubleshooting the AC, you'll want to make sure that the outside temperature is above forty degrees. I want to start from the most basic solution to the most expensive-complicated. The AC compressor exhibited no unusual symptoms that would explain the locked clutch, there was no bearing failure, no unusual noise, no smoke, no fire. The clutch cycling switch senses and controls the temperature in the evaporator core to prevent it from freezing. 2004 ACCORD - A/C Compressor Clutch Circuit Troubleshooting NOTE: Do not use this troubleshooting procedure if the fans are also inoperative. Hi: the car is a '98 camry le, 4cyl with 95k on it. Clutch Cycling Switch. The most common type is a "push-to-make" (or normally-open or NO) switch, which makes contact when the button is pressed. No power is being supplied to the clutch even when bypassing either pressure switch. With fans working as you describe, this is Hondas' order for troubleshooting. When the pressure returns to normal, the cycling switch will close. I found out how to test the A/C Clutch Cycling Pressure Switch , long story short its not working. I have a wiring diagram, but I can't even find the location of the ac on/of switch on it. 5V , RPM A/T more than 800RPMs -M/T more than 700RPMs. Noticed my AC wasn't blowing cold (this was the first time I had it on this season), so I pulled over and saw that the clutch is not engaging. Test the timer control. This test procedure provides a quick and easy method to determine if an operating air conditioning system is adequately charged. a/c low pressure cycling switch is located on top of the accumulator. I know its probably the compressor but the only thing I'm not able to check is the A/C Clutch Diode. Cycling is part of the normal process through which your HVAC operates. I had that problem before and using a carburetor cleaning product on the admission fixed it for a long time, but now it happened again and I can't fix it. Save on ACDelco Air Conditioning Clutch Cycling Switch 15-2962 at Advance Auto Parts. The clutch clicked on and the compressor spins up with bearly a sound but after a short test drive there was no cold air coming out of the vents. Dont run the truck either but submerge the refrigerant can in hot water to build pressure in the can so it can force it into the system. To measure the air gap, you need to slide a gap gauge between the compressor clutch and the bearing face. The AC cycling switch de-energizes the clutch and stops the compressor if the pressure gets below a certain level. I can bypass that if need be. When activated, A/C switch allows compressor clutch to engage, operating compressor. I was told to make the air gap between the clutch and the pulley assembly between 20-30 thousands. Test the lid switch. So beware how the wire is routed when you install your AC Clutch. Before we begin with the actual troubleshooting, to properly troubleshoot the A/C system, it's extremely helpful to understand how the automobile A/C cycle works. One of the most common problems is a low refrigerant charge, the low pressure switch prevents the AC clutch from engaging when the system is low on refrigerant. So if I continue with the chart (as if the relay isn't cycling, I remove the relay, and jump two of the pins on the harness to see if the clutch engages, but it doesn't. The most likely answer is that there is a leak in the system and the refrigerant has escaped the system although there are problems with that explanation. Some variants of the clutch cycling temperature switch comes with preset or adjustable settings for easy evaporator maintenance. you might have a bad pressure switch. In short that means the clutch is meant to cycle on/off. If you are seeking top-quality and affordable air conditioning parts for your vehicle, then UAC products offered at CARiD are what the doctor ordered. He said there is a extension on the compressor clutch and if it end up not working they will reimburse me for the relay and inspection. You can do it the way mentioned above, or you can test it another way. 0 IN, Package Weight--0. Symptoms of a Bad or Failing AC Pressure Switch. From the fuse, that circuit goes to the A/C selector switch, then to the cycling switch, then to the high-pressure cut-out switch, then to both the PCM and the A/C relay in the CCRM. when the switch opens the pcm shuts the ground off for the relay. com ® permission to use it in future advertisements and promotions. If your chill test does not cause the compressor clutch to disengage then most likely the thermostatic switch needs to be replaced. Could be, but pressure is the 1st thing i would check. The switch is generally located on the side of the accumulator. It has two small wires. Check all connectors for proper seating, including those at the fan, thermostatic switch, relay, controller (if equipped), the A/C clutch cycling pressure switch and the A/C compressor. 2)ECT sensor 169-194F, TP sensor about. If you’re here, chances are you’ve tried to recharge your AC system and found a compressor clutch not engaging issue. Air Conditioning Clutch Cycling Switch Stay with the parts brand your vehicle came with and get the GM quality you know and trust with ACDelco GM Original Equipment Air Conditioning Parts. The reason I ask about not using the gauges to check the switch is because its about 27 degrees out. The cycling switch cycles the compressor on and off on the low side of the system. On the clutch cycling switch right rear of engine bay (2 pin) check the red/yel for power. The 10amp AC fuse is good so that's not the problem. He said there is a extension on the compressor clutch and if it end up not working they will reimburse me for the relay and inspection. Check clutch air gap. 7) Test the pressure switch for continuity with an ohm meter. TEST the system for normal operation. If the switch had contimuity static, and the clutch does not engage, then test the coil in the clutch for continuity. You could have an electrical problem like a bad low pressure switch on the drier that is not sending power to the compressor clutch. Genuine GM part is guaranteed by GM's factory warranty!. Going down the field or the road, you may not be aware of this duty-cycle since the interior duct discharge temperature stays almost. All you have to do is break the wiring and add another interlock that opens up when the Blower is off. A simple test is to use a short wire, temporarily connecting the terminals. TEST the system for normal operation. A/C Clutch Cycle Switch (SW9701C) by UAC®. Make sure the refrigerant compressor’s drive belt is not damaged and is correctly tensioned. So, we'll begin by discussing automotive air conditioning theory of operation. Your car's air compressor pressure switch, is responsible for giving and cutting off power to the air compressor of the air conditioning system. I noticed that when the AC, and defrost modes are selected, the AC compressor kicks on as normal. Check the black wire for ground. When this fuse is pulled the AC button doesn't light, when you plug it back in it does light I have checked the connector to the clutch on the AC compressor and its not getting 12v with the AC button pressed I am guessing its either: AC relay (if there is one) Dashboard button issue (that lights but doesn't send 12v to the clutch). The Hummer has a cutout switch in series with the air conditioning compressor clutch that will prevent it from actuating if the outside temperature is colder then approximately 45 degrees. If the clutch engages, the problem is the clutch power supply (relay, fuse, wiring, switch or control module). Even though I live in Florida, on the rare occasion that I turn the AC off, I would like the thing to actually turn OFF. occasionally this is enough to make the high pressure transducer see correct pressures and start to. the pcm monitors many other componets when out of range this will prevent ac clutch from. I then jumped the AC relay to and noticed the clutch would cycle erratically despite being commanded on. Next suspect, Pressure cycling switch, O'reillys computer doesn't show the car to have one. If you jumper the 4 post relay right under the hood the clutch will engage and build pressure until there is about 40 PSI on the low side. So I go looking for the AC compressor clutch cycle switch so I can short the wires to keep the compressor engaged. use volt meter and check for voltage at both switches. If they are good, then it could beyour high/low pressure switch, your ambient temperature interlock temperature switch, your wiring or your clutch coil going bad. so you didnt need to test the pressure switch, you need to test the compressor clutch. One of the things missing in the Pantera air conditioning system is a high/low pressure switch. Upload your own picture of the Mustang Air Conditioner (A/C) Clutch Cycling Switch (96-98) Please make sure to hold your device horizontally (like a camera) rather than vertical (like a phone). Let's first of all understand how the compressor starts to 'pump' when we switch the air conditioning on inside the car. If it is not coming on then check ac relay, cycling switch. This switch is designed to make sure that the pressure stays at a consistent level so that the AC can function correctly. 8 IN, Package Length--1. Buy a 1997 Chevrolet Blazer A/C Clutch Cycle Switch Connector at discount prices. Best diagnostic tool is a set of R134a gauges. The cycling switch cycles the compressor on and off on the low side of the system. Page 16 2001 F-150 Workshop Manual Is the voltage greater than 10 volts? INSTALL a new function selector switch. It will only allow you to engage th ac compressor clutch. Two relays control fan speed (one high and one low). I turned the A/C off and stopped putting R-134a into it becuase the compressor cycling was almost causing the car to die from the load it was putting on the engine. It will only allow you to engage th ac compressor clutch. I did touch on the operation and the basic principles behind how the converter clutch works on my page about the transmission valve body if you want more information. What I'm looking for is a rectangular box with 5 wires coming out. You can adjust it one turn counter clockwise (that should do it) until it cycles the compressor at about 21psi. If the compressor still does not operate properly, refer to HVAC Compressor Clutch Does Not Engage diagnostic in SI. Learn the basics and more. Jeep Cherokee 1997-2001: Why is the A/C Not Working? The air conditioning system in your Jeep Cherokee is quite advanced, but it doesn't have to be very complicated to find out what is wrong when it is malfunctioning. (70 degrees oustide about 70 psi on high and low sides - temp. 3322 ext 2727. At some conditions, GM Low Pressure Switch Cycling is expected. Figure out what's wrong with your car's A/C and fix the problem yourself, all for less than the diagnosis alone would cost at most auto repair shops. If the clutch engages, the problem is the clutch power supply (relay, fuse, wiring, switch or control module). If you are troubleshooting your system, you may also want to test the pressure switch itself. Most imports utilize a high pressure switch to cycle the fan On smaller such vehicles a WOT Wide Open Throttle or low vacuum switch is employed ANd if you really want to get crazy Ford uses a Power Steering switch to save power and cut the compressor when theres a demand for power steering. You can disconnect the wiring harness and insert a jumper wire across the terminals and the clutch should kick in and run constantly if the wiring,compressor,and clutch are functioning properly. With the engine running, turn the A/C control or switch to "on" at the dashboard. It has finally gotten hot and it seems we are fully into air conditioning season (let’s hope it stays fo a while). Jeep Liberty compressor clutch cycling switch. if the switch has high pressure it opens. To look at the condition of the compressor, you need an ac manifold gauge set so you can see the refrigerant levels in both sides of the ac system, and how well the compressor is working (if at all). Testing compressor clutch/wiring: Key on engine off, Jump the A/C clutch relay from pin 30 to pin 87, Compressor clutch should "click". Ford Air Conditioning Clutch Cycling Pressure Switch Repair Connector. He said there is a extension on the compressor clutch and if it end up not working they will reimburse me for the relay and inspection. Noticed my AC wasn't blowing cold (this was the first time I had it on this season), so I pulled over and saw that the clutch is not engaging. Maybe the relay or the a/c clutch was. Next moved on to the pressure and cycling switches (located on accumulator and compressor discharge tube) Again, they tested good, but I had spares, so replaced them anyway. If low on refrigerant the cycling clutch switch will be open at the H / expansion valve at the firewall. 8 , both directions. Check the black wire for ground. I had that problem before and using a carburetor cleaning product on the admission fixed it for a long time, but now it happened again and I can't fix it. What is being talked about is jumping the low pressure switch at the receiver-dryer. I took it to Goodyear and they tested it. (IPDM) Very simple procedure is the Auto Active Test described in section PG-22. The AC will turn on if I jump 12V to the blue/yellow wire in the pressure switch near the radiator. com ® permission to use it in future advertisements and promotions. Install the clutch on Compressors purchased without a clutch and set the clutch air gap per OEM specifications. To measure the air gap, you need to slide a gap gauge between the compressor clutch and the bearing face. Fan clutch disengages when I disconnect the air line so I know it works. Just replaced the fan clutch solenoid with OEM part, since it was the original and not overly expensive. The Accumulator/Drier collects and absorbs. The AC compressor exhibited no unusual symptoms that would explain the locked clutch, there was no bearing failure, no unusual noise, no smoke, no fire. TEST the system for normal operation. During winter months many heat pumps will need to go through a “defrost” cycle during operation. just the AC clutch. The switch will open and cause the system to stop operating under certain conditions which may hurt the system. Page 1 of 2 1 2 Next >. No power is being supplied to the clutch even when bypassing either pressure switch. I did find this reference to the 2005 which is probably identical to the 2007 circuit but I'm not sure. Air conditioner low pressure switch defective. The sol turns on the clutch. Symptoms of a Bad or Failing AC Clutch Cycling Switch. Take caution when doing this as you can cause damage if you are not familiar with how your AC electrical system works. Just trouble shooting to see what is wrong before paying for work. AC System Service, Diagnosis and Repair. As mentioned, AC output is weak now. If you jumper the 4 post relay right under the hood the clutch will engage and build pressure until there is about 40 PSI on the low side. Air conditioner system discharged. Use a paper clip to jump the cavities, but do not shove the clip wires into the cavities unless you hammer or file the wire ends down so they fit the cavities snugly but do not expand them too much. I turned the A/C off and stopped putting R-134a into it becuase the compressor cycling was almost causing the car to die from the load it was putting on the engine. 06-14-07 01:49 PM - Post# 1185904 would the diode inline with the ac comp keep it from cycling ? i just changed the clutch and there's power to the clutch connector green wire, plenty of 134 and the fuses are good. Find out what is wrong and get it fixed. When it comes to your Hummer H2, you want parts and products from only trusted brands. If you want to contribute your AC-related fix or experience, please go to the relevant forum and click the NEW TOPIC button and write what you know. Also yesterday I found both the brown wires that go to the ac thermostat had melted together and shorted out. At some conditions, GM Low Pressure Switch Cycling is expected. With fans working as you describe, this is Hondas' order for troubleshooting. My ac will not cycle when putting 12V onto the purple wire. It is easier to bypass the cycle switch than it is to test it. Measure the voltage between the A/C cycling switch C139 pin 1, circuit 441 (RD/YE) and ground. The switch is generally located on the side of the accumulator. Turn the ignition switch OFF. The clutch cycling switch senses and controls the temperature in the evaporator core to prevent it from freezing. The switch on the accumulator is to keep the evaporator from freezing up by cycling the compressor clutch. A/C-HEATER SYSTEM 1995 Chevrolet Tahoe 1995 AIR CONDITIONING & HEAT General Motors Corp. Ford Cars and Trucks 1980 thru 93. From everything I've read about converting to R134 sounds like too much of hassel with mixed resuts. The relay switch keeps moisture from freezing on the evaporator core. Make sure the refrigerant compressor’s drive belt is not damaged and is correctly tensioned. If jumping the low pressure switch doesn't engage the clutch, confirm that the AC clutch is still good. It just needs to be snug. so you didnt need to test the pressure switch, you need to test the compressor clutch. Do you have the draws ECM to AC clutch ralay, and instruction how to test it, Some thing is around ECM, AC realy, and AC clutdh switch. 04 Matrix AC clutch won't engage Post by mrlullabye » Fri Apr 17, 2009 12:33 pm Air Conditioning problem 2004 Toyota Matrix 4 cyl Front Wheel Drive Manual 110000 miles I changed the clutch in my 2004 Toyota Matrix this weekend, and low and behold the AC clutch will not engage now. My blower is working correctly, by blue AC switch lights when depressed, but compressor clutch is not engaging, nor is the idle advancing. Check out our options and find the part you need for your car, truck, or SUV. I believe blk/yel is low side pressure and dk grn/org is high side cut off. Check the black wire for ground. A biased switch contains a mechanism that springs it into another position when released by an operator. The clutch may be bad. Car AC Clutch Wont Engage When the car AC clutch won't engage you turn on the air conditioning and patiently wait for cool air that never comes. Re: AC Compressor cycles on/off too quick I know it has been some time, but I am also in the exact same boat, that the AC in my fordranger started c\ycling on and off rapidly right after replaceing a timeing belt. Remove the jumper from the plug. If it does, then the PCM is not happy about something. 5V , RPM A/T more than 800RPMs -M/T more than 700RPMs. I've determined that whatever provides the grounding path for the clutch relay does not do it. Ground compressor clutch circuit. The cycling switch screws to the top of the accumulator / drier. when the switch opens the pcm shuts the ground off for the relay. I then jumped the AC relay to and noticed the clutch would cycle erratically despite being commanded on. Jumpering the ac clutch will not tell you anything about the health of the ac compressor. Next check continuity through the coil in the ac clutch. UAC's line of electrical components includes the Switches and Relays that are necessary for the proper function of an A/C System. This switch works to keep the air conditioner full of the refrigerant it needs, in order to keep the AC blowing cold air. NOTE: The A/C System is designed to cycle the Compressor Clutch on and off to regulate the temperature inside the Evaporator housing, so it is normal to see the Compressor Clutch engage and disengage during the use of the AUTO setting of the Climate Control System. Remove the component from the socket and test for a power signal and a good ground at the proper terminals. The place to start is gauge readings of the high and low side pressures. If you need a replacement part, O'Reilly Auto Parts has a selection of switches, including an A/C clutch cycling switch, available for most models. Just replaced the fan clutch solenoid with OEM part, since it was the original and not overly expensive. During an AC system test the high side pressure was found to be excessive and the compressor continued to run. I've encountered the same problem (flashing AC indicator on climate screen) a couple times. Some of these switches include your pressure switch, cycling clutch switch, condenser fan switch, and temperature switch. If there is not enough refrigerant, the low pressure cut out or the clutch cycling switch may prevent the system from coming on. Inspect the motor coupler. If the compressor still does not operate properly, refer to HVAC Compressor Clutch Does Not Engage diagnostic in SI. If the clutch fails to cycle on and off when the A/C is turned on, jumping the clutch lead with a jumper wire from the battery will show if the problem is in the clutch or elsewhere. For instance, a leak in the system allows the refrigerant to escape. Can You Guys Help w/my Silverado AC Clutch/Compressor? Discussion in ' Troubleshooting & Diagnosis ' started by gordonquixote , Jul 16, 2011. This is controlled by the low-pressure switch, which is installed on the accumulator. Check the operation of the climate control and the A/C button. its easy enough to test by jumping the two pins on the male connector and seein. Free shipping. Accumulators are on the low side of the system between the evaporator and the compressor. it will cycle on and off very quickly at the start as the pressure drops, then builds. Upload your own picture of the Mustang Air Conditioner (A/C) Clutch Cycling Switch R-12 (82-93) Please make sure to hold your device horizontally (like a camera) rather than vertical (like a phone). It's important to replace the old tube with the correct one. Next moved on to the pressure and cycling switches (located on accumulator and compressor discharge tube) Again, they tested good, but I had spares, so replaced them anyway. My ac will not cycle when putting 12V onto the purple wire. it could be a sign that the cycling switch is not functioning properly. 3B Scientific Scientific Scientific U33010115 AC DC Power Supply 5 kV (115V, 50 60Hz) 4ec2c3 Generic 4pcs lot RC car 1 10 OffRoad Tires for HSP HPI 94107 94166 94106 RC car Parts F4 , Ceramics 12 Hole Alto C Ocarina, Good Instruments Toys Flower(No Handrest),. Thing is, I don't know where that's located. I still think I may have an ac theromstat problem. Anyone know if the A/C Pressure cycling switch is an issue (or TSB) with the 1999 Silverado's? My A/C clutch started to cycle on & off recently and remember reading about it here. a/c low pressure cycling switch is located on top of the accumulator. Step 2 – Check for leaks. Check the relays. I did that to mine while I was replacing all the o-rings in the system. You now know what to do when AC compressor clutch is not engaging. Relays can also switch multiple things on simultaneously while using one output, allowing, for instance, you to turn on your car's radio at the same time the antenna extends. However if the chill test works and you have an icing problem the icing is related to the position or contact of the end of aluminum capillary in the evaporator's coils. Check blower resistors for open condition. If you do so with the engine not running, you can then turn the compressor pulley by hand to make sure your compressor isn't locked up. Also, ignoring a simple voltage check on the pressure switch can lead to repeated compressor clutch failure. If the compressor kicks on, then the switch is bad. With air conditioning season comes a whole other set of diagnostics that we probably all have forgotten over the long winter. If they are good, then it could beyour high/low pressure switch, your ambient temperature interlock temperature switch, your wiring or your clutch coil going bad. Although full current was never approached (the light draws only about 300 ma), I did find bad connections. Before performing symptom troubleshooting, check for powertrain DTCs. Jump the low pressure switch only to test the circuit. As your question, I jumped from negative bettery to one of teminal AC pressure switch, I'm not sure what number it is. It has two small wires. When A/C switch, AUTO switch or DEF switch is pressed, front air control transmits compressor ON signal to ECM, via CAN communication. The cycle switch will cut the power to the air conditioner clutch. Clutch plate air gap between the plate and the pulley in specs. With easy online ordering and same day shipping. The clutch cycling switch cycles the compressor according to the pressure in the accumulator. My ac will not cycle when putting 12V onto the purple wire. the pcm monitors many other componets when out of range this will prevent ac clutch from. When the pressure has dropped to a certain level, this switch activates and allows high pressure from the other side of the A/C to enter in order to even out the pressure. GM OEM Air Conditioning Low Pressure Clutch Cycling Switch. The clutch clicked on and the compressor spins up with bearly a sound but after a short test drive there was no cold air coming out of the vents. If you need a replacement part, O'Reilly Auto Parts has a selection of switches, including an A/C clutch cycling switch, available for most models. Viking Cycle Rain Gear offers you the freedom and comfort of movement for every biker’s needs in heavy rainy weather. If it is lower than the shut-off point for the low-pressure protection switch, then it’s likely that you have a leak in the system. There are two basic types of automotive air conditioning systems. If the clutch fails to cycle on and off when the A/C is turned on, jumping the clutch lead with a jumper wire from the battery will show if the problem is in the clutch or elsewhere. My AC would randomly start and stop intermittently, so I ensured that the system was charged and once I was assured that it was full I checked this switch and it was the culprit. In some vehicles, these are two separate parts, in others they are combined into one. If it does, the clutch itself is OK. If you have power at the clutch connector and a good ground, then you you may have an open coil (should be. compressor clutch still didn't engage. Buy ACDelco 15-5715 GM Original Equipment Air Conditioning Clutch Cycling Switch: Clutches - Amazon. A/C Compressor Clutch Cycle Switch by UAC®. Does the clutch engage when you jump the relay terminals? If not, check for 12V+ power at the relay itself. use volt meter and check for voltage at both switches. Inspect that clutch air gap for its recommended spacing. One of the parts of the air conditioner that is most likely to fail is the cycling switch. It could still have either a cooling system issue or electrical issue with in the AC, climate controls, or mechanical issue with the Ac such as the Expansion valve. Next check clutch itself. Using a multimeter, check resistance between Figure 1-2. Each time she cycled it, I could feel the click in the relay and it open/closed and saw the clutch engage as it should. If the clutch fails to cycle on and off when the A/C is turned on, jumping the clutch lead with a jumper wire from the battery will show if the problem is in the clutch or elsewhere. connector terminals (1). --Fuses OK-. Before performing symptom troubleshooting, check for powertrain DTCs. Place an ohm meter probe on each pressure switch terminal and verify the switch has continuity. my ac system blows hot air so i thought the pressure was low, and got a can of r-134a and added it. if you had a gauge set it could be easier to diagnose. It is engaged and disengaged as needed by an electro magnetic clutch. One of the things missing in the Pantera air conditioning system is a high/low pressure switch. Had AC friend to check pressures and amount of coolant and all normal. Most troubleshooting points at the CCRM, but I just put the new one in and it still wont turn on. By using a diode, you take and block the positive side of the AC and only use the DC or negative side to charge a battery (see Figure 2). If not, replace drive solenoid. Just replaced the fan clutch solenoid with OEM part, since it was the original and not overly expensive. Although full current was never approached (the light draws only about 300 ma), I did find bad connections. Ford F-150 A/C Clutch Cycle Switch Your Ford F-150 will be happy to know that the search for the right A/C Clutch Cycle Switch products you’ve been looking for is over! Advance Auto Parts has 8 different A/C Clutch Cycle Switch for your vehicle, ready for shipping or in-store pick up. It just needs to be snug. The clutch cycling switch senses and controls the temperature in the evaporator core to prevent it from freezing. compressor clutch still didn't engage. In this tech article VETTE provides an air conditioning troubleshooting guide to show you how to diagnose and repair common Corvette A/C problems - Vette Magazine Clutch-cycling switches. A/C-HEATER SYSTEM 1995 Chevrolet Tahoe 1995 AIR CONDITIONING & HEAT General Motors Corp. Disconnect the connector and while being careful, short the two wires together while the truck is cranked and see if the clutch clicks and the compressor spins. As your question, I jumped from negative bettery to one of teminal AC pressure switch, I'm not sure what number it is. 7 engine, I am not getting any voltage to the AC clutch. The pressure of the AC system fluctuates depending on several factors, such as the ambient temperature, age, and the amount of refrigerant in the system. If you need a replacement part, O'Reilly Auto Parts has a selection of switches, including an A/C clutch cycling switch, available for most models.