Unplug the compressor from the electrical outlet, and bleed air from the tank. The first thing to do is to check the two fuses that control the ac compressor, fuses k11 and f7 in the fuse box under the hood. GMC AC button flashes thrice and does not turn on. Can got cold but it only took about 1/4 of the first can. A pressure switch controls the pressure of the refrigerant inside the AC circuit. Make sure you have the windows open, so the air doesn’t cycle itself. As a result, the AC compressor will be forced to keep running non-stop to cool down the cabin to your preferred temperature. A/C compressor not turning on?. This will likely cause various AC problems, including short cycling. Reasons Why Your AC Compressor Isn’t Working 1. If the pressure gets too high or too low, it could damage the whole system. Car AC Compressor Not turn on Reasons And Solutions. Power and electrical-related issues are common causes for your ac compressor not working. Step 3 Turn the fan speed on the highest setting and set the AC to the coldest setting. Why Is My AC Compressor Not Turning On? How to Fix. The system cycles off of pressure because there is no freeze switch. The most common causes that hinders normal operation of air conditioning system on your Chevy Silverado 1500 are dirty cabin air filter, refrigerant leak, dirty or clogged condenser, dirty or clogged evaporator, bad blower motor, defective compressor, faulty blend door actuator or any fault in the electrical system. Home AC Compressor Not Turning On. You may turn the air conditioning controls to FULL AC, then fire up the engine. The AC compressor runs off of a fuse. Have someone watching the A/C compressor. High or low-pressure switch. A dirty condenser coil will cause high head pressure in your AC, tripping the high pressure switch Dirty air filter. The most common reason why your AC clutch is not engaging is that the AC refrigerant level is too low or too high. Engage AC Compressor Clutch with a Paperclip on Relay. AC Compressor Clutch Is Not Engaging. Inside the engine bay – A/C compressor mounted to the engine with belt installed It’s Not Getting Power The compressor needs to get voltage before it can turn on. Car A/C compressor Not turning on (10 reasons WHY …. Insufficient Lubrication How to reset an AC Compressor. These include low or excess refrigerant and insufficient oil. Click to expand System has to be running to check proper low side pressure. Ecobee 3 Lite not turning on AC compressor? I previously had a traditional thermostat controlling my heating and AC. One easy way to tell whether the compressor is seized is to try to turn the compressor clutch, which is attached to the compressor shaft, by hand (you do NOT need to remove the drive belt to do this). Compressor clutch not engaging >How to add freon to ac system. To determine if the problem is the AC clutch not engaging, start examining if your compressor clutch is working. The first thing you want to do is check a wiring diagram and repair manual for your particular car model. A pressure switch controls the pressure of the refrigerant inside the AC circuit. Turn the AC on using the dials on your dashboard. A pressure switch controls the pressure of the refrigerant inside the AC circuit. If the belt is off track, damaged, or it slipped off of the pully holding it against the compressor, your AC system wont work properly. A/C compressor not engaging. The a/c will not blow on the 1 setting then on 5 it blows only hot air. A defective capacitor is the most common among the top issues that can stop your compressor from running. Keep in mind, however, that the engine can still overheat with the heater on, so youll need to monitor the temperature gauge carefully. A/C compressor wont turn on. The biggest sign is that you stop getting cold air from the air conditioner. C Compressor: Symptoms, Diagnosis, Replacement Cost>Bad A/C Compressor: Symptoms, Diagnosis, Replacement Cost. Either the high side pop-off valve on the compressor pops off with a bang, the compressor gets too hard to turn and the belt starts slipping, or the coil in the firewall (evaporator) turns into a block of ice. Ive read other threads with very similar symptoms and Im thinking. com/_ylt=AwrEsOU3iVpkrscJTWxXNyoA;_ylu=Y29sbwNiZjEEcG9zAzIEdnRpZAMEc2VjA3Ny/RV=2/RE=1683683768/RO=10/RU=https%3a%2f%2fwww. Check the cabin air filter and condenser coils for any debris. A/C compressor not engaging I have a 2013 5. Burnt fuse To determine if the problem is with the fuse, the first thing to do is turning off the car’s engine. To carry out this process, open the drain valve and release the air. To see if it is the issue get a piece of wire for a jumper and go from the switch to the plug on the AC by going out the door. AC Compressor went bad end of last summer, was locking up internally and making a ratcheting noise, was replaced with new unit including clutch, also replaced AC belt tensioner which appeared to be worn, everything worked fine after replacing. The AC compressor is getting a command to turn on but is no longer able to, which would indicate that it needs replacing. Will the low freon cause the high or low pressure switches to not close and could this be the. How to Get AC Compressor to STOP Turning ON & OFF …. While your adding watch and make sure your engine fan still cycles. When you suspect your AC compressor might be failing, always have the problem diagnosed by a qualified professional right away. The other two are in the back and its hard to see which one is the one thats rotating Ok so if I replace the actuators and if the air doesnt blow cold what would be your next move since the other code is for high pressure protection. Bad wire connectors and corroded, broken, and melted wires could be why your compressor is not turning on. In fact, when your vehicle is placed in the DEFROST mode, the air conditioning (A/C) is automatically engaged. The most likely cause of malfunctioning AC compressor is an electrical problem, bad compressor clutch, or a broken compressor. You now just narrowed it down to either low refrigerant or a bad pressure switch. 2 Listen for unusual noises coming from the AC. Turn the car’s fan motor on high and press the button to turn on the AC. Start the engine and operate the AC system. The first sign that the air conditioning pressure switch is bad is when the system shuts off intermittently. Then move one knob at a time and see which one is hanging up, skipping, or not working Ask Your Own Medium and Heavy Trucks Question. The a/c will not blow on the 1 setting then on 5 it blows only hot air. The most likely cause of malfunctioning AC compressor is an electrical problem, bad compressor clutch, or a broken compressor. It’s…>My air conditioner is not working on my semi truck. This then causes the RPM to jump back up again and then settle to a comfortable idle speed. 8 Reasons Why Your Car AC Compressor Wont Turn On (and Solutions) 1. A dirty condenser coil will cause high head pressure in your AC, tripping the high pressure switch Dirty air filter. AC Compressor Not Turning On? Heres What to Do. These faults will both keep the compressor from kicking in and the door fault will cause your concern. Check that the low-voltage wires, especially from your. Perform a visual check to see if the compressor is running. Put the guage on the low port fitting and it said it was full. 2004 Chevy Truck A/C compressor does not engage part 2 ScannerDanner 365K subscribers 203K views 5 years ago Here is a link to part 1 https://youtu. 2004 Chevy Truck A/C compressor does not engage part 2 ScannerDanner 365K subscribers 203K views 5 years ago Here is a link to part 1 https://youtu. kalamykid : with your digital volt meter see if you have power to both sides of each fuse with the ignition switch in the run position engine not runnning Customer: ok be right back Customer:. AC Compressor Clutch & Replacement Cost>6 Signs Of A Bad AC Compressor Clutch & Replacement Cost. The AC compressor runs off of a fuse. AC compressor will not come on. Unplug the wiring connector to the AC clutch on the compressor. Either the high side pop-off valve on the compressor pops off with a bang, the compressor gets too hard to turn and the belt starts slipping, or the coil in the firewall (evaporator) turns into a block of ice. A dirty air filter will cause airflow restriction, potentially freezing up your evaporator coil and Lack of. If you notice your compressor not working after turning on your thermostat, there could be a power cut to your outdoor unit. Causes of an AC compressor not turning on Dirty condenser coil. Both trucks compressors cycle off at 20psi on the low side and turn back on pretty quick after, the compressor will do this 3 times and then turn on and stay on till the high side builds to 250psi and turns on the engine fan to lower system psi. 0l f-150 and my a/c compressor will not engage Ive check my refrigerant level, fuse, relay and have done a EOEO test and all of that is fine. Turn On Air Conditioning Leave the engine running and turn on the air conditioning in full blast. A capacitor is an important part of your ac condenser unit because it powers your compressor and fan motor. AC compressor clutch is not engaging. Jump both pins with a paper clip on the electrical connector. Case #1: AC Compressor Not Working, but Indoor Fan is running. HELP!!! AC not engaging; bad PCM?. If the compressor cycles on, turn it off. AC Might Not Be Working At All. AC Compressor Not Kicking On. The AC compressor can be jump-started by shorting its control relay. I have an international truck and the ac compressor is not…. Ive read other threads with very similar symptoms and Im. But overfilling usually causes one of three things to happen. Was a click heard when the AC was engaged? Is the center hub turning? Observe the pressure gauges. One easy way to tell whether the compressor is seized is to try to turn the compressor clutch, which is attached to the compressor shaft, by hand (you do NOT. Pin ID is on the bottom of the relay. Low Refrigerant in the AC System. Step 1: Turn on the AC. You will need a set of AC pressure gauges to check the following. Disconnect the connector from pressure switch. 1st truck is 07 367, has a new condenser, orfice tube and accumulator, 2nd truck is 07 378, has a new compressor, both charged to 2lb8oz as the decal on the firewall states, and both cycle the same as I described < which I dont think is normal, there should be more of a delay between compressor clutch on cycles. Jump both pins with a paper clip on the electrical connector. Common Causes of AC Clutch is Not Engaging. AC COMPRESSOR NOT ENGAGING NOT BLOWING COLD FIX CHEVROLET MALIBU EQUINOX CRUZE SONIC TRAX TAHOEIf your car AC is not blowing cold and the AC Compressor is no. then stuff the wire in the opening in the back if the plug youll know if it works or a short if it does not work the compressor has an electric engaged clutch there are contacts on the springs that draw together like a …. To see if it is the issue get a piece of wire for a jumper and go from the switch to the plug on the AC by going out the door. Turn on your AC even if it isnt working, and go to the front of your car to listen to the compressor. Unplug the wiring connector to the AC clutch on the compressor. This is by far the most common issue as to why your AC is not working. Perform a visual check to see if the compressor is running. We’ll explain more about each one below. @SolarMike The AC load aspect is not so simple: a reasoning straight as yours might apply for an externally controlled variable displacement compressor, where the AC system is actually able to regulate the refrigerant flow, but internally controlled VDCs actually work on full flow until the evaporator reachs freezing point and then they start destroking, while fixed displacement compressors. As a result, the evaporator coil can become frozen and pressure in the refrigerant can drop to an unwanted low level. com%2fcar-ac-compressor-wont-turn-on-8-reasons-and-solutions%2f/RK=2/RS=WAuWPXi9J8H3b4_ufzMvtJ_zg84- referrerpolicy=origin target=_blank>See full list on motorhills. Compressor clutch not engaging (chevy silverado) Jose Soto 308 subscribers Subscribe 912 154K views 4 years ago Video will explain how to add freon into ac system wen ac. So the system is very sensitive to proper charge. Thats the one I can see that rotates when i turned the temo from cold to hot. Have someone watching the A/C compressor while you start the truck and turn the A/C on. If the problem is in the relay, its much easier and safer to just replace it, than to manually start the AC. 5 Symptoms of AC Compressor Failure. If the AC does not come on then its an electrical issue. A Clogged Condenser FAQs: Does an auto AC compressor run all the time? How long should the AC clutch stay engaged? How to manually engage the AC compressor clutch? Conclusion. So you’re right to be worried. Initially the compressor engages normally and AC works as it should. The most common causes that hinders normal operation of air conditioning system on your Chevy Silverado 1500 are dirty cabin air filter, refrigerant leak, dirty or clogged condenser, dirty or clogged evaporator, bad blower motor, defective compressor, faulty blend door actuator or any fault in the electrical system. You can pull the compressor relay and use a jumper from the battery to the receptacle for the output lead of the relay. Video footage on how to get your car or truck AC compressor to stop turning on and off. Have someone watching the A/C compressor while you start the truck and turn the A/C on. This removes water vapor and keeps the inside of your windshield clear. Verify if this light turns on when you reach MAX A/C. Wait a few minutes for the system to warm up. You can pull the compressor relay and use a jumper from the battery to the receptacle for the output lead of the relay. When a lack of pressure or an excessive amount of it is detected, this switch makes the compressor stop working. A refrigerant leak can be anywhere in the A/C system but can be easily found with the proper tools. Identify the AC compressor relay by looking at the diagram located on the back of the fuse box cover, or in the owner’s manual. Reasons Your Car AC Compressor Is Not Turning On (SOLUTION). If there are two wires, these are normally just a signal and a ground wire. If it does, the connection just needs to be cleaned and tightened up. Air Compressor Wont Start. What then happens is that the engine management software on the ECU detects that the idle speed has dropped and adjusts the idle control valve / throttle flap position accordingly. Clutch will turn by hand, engine running and not. Turn the a/c on max, high fan. You can try to wiggle the connector and see if it comes on,. When you click the dial on your center console to cold nothing. Go out and wiggle the crap out of that connector. The AC compressor runs off of a fuse. If it the AC stays on, you have a clutch issue. Turn on your AC even if it isnt working, and go to the front of your car to listen to the compressor. The only way to troubleshoot a capacitor is by replacing it and testing the unit, so this is commonly done when an AC compressor won’t turn on. The clutch isnt engaging at all. As a result, you may have to decide if it’s worth repairing an older air conditioning compressor or better, in the long run, to replace it with a newer, more reliable one. The compressor is the heart of your car’s air conditioning (A/C) system. Traditional compressors are also referred to as positive-displacement compressors because they move the same amount of refrigerant with each revolution. Start Relays – As with the capacitor, the HVAC technician may try replacing the start relay, which is the only surefire way to determine whether it’s working right or not. Air Compressor Not Turning On – Is The Pressure Switch Faulty? Check the pressure witch if the air compressor motor won’t start. You could take a chance and crimp the female connectors a tad, and hope for the best, you could replace the connector. You should hear the AC compressor working or attempting to work. Here are 10 common reasons why the A/C compressor wont turn on. This can also be labeled as MAX A/C. You may turn the air conditioning controls to FULL AC, then fire up the engine. Initially the compressor engages normally and AC works as it should. Head over to check your condenser unit and find out if both your compressor and the fans are not working. After running constantly, the AC compressor will start turning on and off more frequently than before. Either of these two scenarios will require that the compressor be replaced. Start the engine and operate the AC system. However, you also have to jump-start the AC fan and the condenser to make the whole system work. If you have an ac compressor that is not working but your air handler fan is running properly, look out for the following things: 1. When the AC compressor clutch goes bad, the air conditioning may not work at all or it can work intermittently. Discussion Starter · Feb 20, 2019. It is not recommended to use the DIY kits of freon or a recharging kit. I have an international truck and the ac compressor is not…. Here are a few more steps on how to test an AC pressure switch: 1. The AC button has a light on the button that illuminates when the air. Compressor clutch not engaging (chevy silverado) Jose Soto 308 subscribers Subscribe 912 154K views 4 years ago Video will explain how to add freon into ac system wen ac compressor clutch. A defective compressor capacitor could be why your ac compressor is not turning on. Unplug the single wire connector on the front side of the compressor. When you suspect your AC compressor might be failing, always have the problem diagnosed by a qualified professional right away. Causes of an AC compressor not turning on Dirty condenser coil. There’s a lot that could go wrong with the air conditioning system, but by correctly identifying the source of the problem, we can narrow down the possible causes. There are three reasons why the compressor clutch does not engage, especially if the sensor detects them. Car Overheats When the A/C is On: Causes and FAQ. 1998 Dodge Ram AC clutch wont engage. Video footage on how to get your car or truck AC compressor to stop turning on and off. Check the front of the compressor clutch. If it’s out of spec, ipyou need to either replace the clutch, which is what I tried to do but it was such a pain in the ass, and a split an o ring, so I had to replace the compressor, it’s only like 30 bucks more to replace the whole thing so that’s what I did. The only way to troubleshoot a capacitor is by replacing it and testing the unit, so this is commonly done when an AC compressor won’t turn on. Ask Your Own Medium and Heavy Trucks Question image. To see if it is the issue get a piece of wire for a jumper and go from the switch to the plug on the AC by going out the door. Here is a link to part 1 https://youtu. Identify the AC compressor relay by looking at the diagram located on the back of the fuse box cover, or in the owner’s manual. If its silent, you may have a fuse that has burnt out or disconnected. Typically this works behind the scenes from around 40 deg F and above. Here is what Ive done, engine running, Max AC, clutch will not engage compressor: Jumpered low pressure line switch Jumpered high pressure line switch Wiggled switch on compressor (could not get it to release, because I couldnt figure it out) Clutch will turn by hand, engine running and not. A bad ac capacitor. To tell which one is faulting I would remove the dash panels from the hvac unit and operate the knobs and inspect all 3 door actuators to see which one is skipping or not traveling the full length. Here are 5 telltale symptoms of AC compressor failure. Make sure the amperage matches up with the one that was blown. Discussion Starter · Feb 20, 2019. The clutch engaged and it started taking 134a. The indicator light flashes three times and turns off when outside conditions affect air conditioning operation. Check if your AC pressure switch has two or three wires. The most common reason why an A/C compressor is not turning on is because of low refrigerant levels. If this wasn’t the case, your AC would be blowing even when the car was turned off. Jumpered high pressure line switch. Which is the temperature one. There are several things that can keep the compressor from engaging the heater-A/C mode control switch the low pressure cycling clutch switch high pressure cut-off switch compressor clutch relay Powertrain Control Module (PCM). Faulty AC Pressure Switch Several switches are needed to activate the compressor clutch. Disconnect the connector from pressure switch. jumping the switch is a good quick test off the electrical system. It can be caused by low refrigerant or high pressure. If the compressor cycles on, turn it off. Attempted to service low pressure port, but since the compressor was not running, the pressure at this port was. AC Compressor Not Turning On? Here’s What to Do. Engage AC Compressor Clutch with a Paperclip on Relay / How to Fix Bypass Wont Engage / Jump Relay Poolarity - Life Hacks 55. The easiest way to test it is to set. Air Compressor Not Turning On - Is The Pressure Switch Faulty? Check the pressure witch if the air compressor motor wont start. When the compressor doesnt turn on at all, it can mean a couple different things. If the fuse blows, the compressor cannot get the power it requires to run. Attach the other end of the jumper wire to the positive terminal of the battery. The most likely cause of malfunctioning AC compressor is an electrical problem, bad compressor clutch, or a broken compressor. The compressor is the heart of your car’s air conditioning (A/C) system. You should hear a low hum followed immediately by the cooling fan turning on. You can try to wiggle the connector and see if it comes on, be sure to check for broken wires at the switch. These faults will both keep the compressor from kicking in and the door fault will cause your concern. Turn On Air Conditioning Leave the engine running and turn on the air conditioning in full blast. Unplug the single wire connector on the front side of the compressor. Here are 5 main things that can stop your ac compressor from turning on. If your car has a “Max AC” setting, select that option. There’s a lot that could go wrong with the air conditioning system, but by correctly identifying the source of the problem, we can narrow down the possible causes. ac buuton and no power to the >What causes no light on the ac buuton and no power to the. If you don’t feel any cold air coming from the vents, you may think it’s a lack of refrigerant, only to find out that the compressor clutch is to blame instead. A/C compressor not engaging. Im not sure if the freon is just low even though the air worked last summer. If the pulley and the clutch are both spinning it shows that the clutch is engaged with the pulley correctly. Case #1: AC Compressor Not Working, but Indoor Fan is running. Not sure if it is pin 30 or 78. Causes of an AC compressor not turning on Dirty condenser coil. You are either too low on freon, you have a power/ground issue meaning the. If the fuse blows, the compressor cannot get the power it requires to run. If there are three wires, it probably has a 5 volt wire, signal, and ground. Car A/C compressor Not turning on (10 reasons WHY and Fixes). With this configuration, the AC compressor and blower would work normally. RPM changing at idle, and/or just annoying, heres how you get it to stop! NOTE:**The system is. Dont jam a large object in the relay receptacle as it will stretch it and cause more problems. Turn on your AC even if it isnt working, and go to the front of your car to listen to the compressor. A defective compressor capacitor could be why your ac compressor is not turning on. My cooling fans run at 100% when I cut the a/c on and stay on until I turn the truck off. How to Troubleshoot the Car AC Compressor Turning On and Off Every Few Seconds. Chevy Silverado 1500 AC not working. Truck Ac Compressor Not Turning OnThis removes water vapor and keeps the inside of your windshield clear. If you don’t feel any cold air coming from the vents, you may think it’s a lack of refrigerant, only to find. Turn the a/c on max, high fan. be/k_KJuqR1gKQ In this video I will show you. Essentially it is like it is working on a 50% duty cycle, starting and stopping every a few seconds. Then turn fan speed for blower motor to 2 and make sure the compressor will cycle off at some point. A Faulty Car AC Pressure Sensor Switch. If its not turning, theres a problem! First try to take the handle of a hammer and tap the hub in, if it pulls in then it needs to have a shim taken out fron under the hub. then stuff the wire in the opening in the back if the plug youll know if it works or a short if it does not work the compressor has an electric engaged clutch there are contacts on the springs that draw together like a. A defective compressor capacitor could be why your ac compressor is not turning on. The compressor doesn’t turn on at all; The system is blowing warm air. jpg Technician: Mike Mcmillan That is a generic mode door actuator fault code. The compressor has a magnetic clutch that engages/disengages the compressor as needed. A/C compressor clutch does not engage, cooling fan does n. be/k_KJuqR1gKQIn this video I will show you how to test an A/C compressor with an empty system and locate the leak. Disconnect the connector from pressure switch. The biggest sign is that you stop getting cold air from the air conditioner. As a result, you may have to decide if it’s worth repairing an older air conditioning compressor or. I believe I have a issue with two of my petes a/c systems, Im not too fluent with orfice tube/accumulator hvac systems. Bad A/C Compressor: Symptoms, Diagnosis, Replacement Cost. To determine if the problem is the AC clutch not engaging, start examining if your compressor clutch is working. A/C Compressor Clutch do not engage, Cooling Fan do not turn on, Condenser Fan do not turn on, Ceiling light do not turn on when I open a door, emergency brake dashboard indicator always on. If the compressor is hard to turn or does not turn at all, the compressor has failed internally. I bet your compressor will kick on. Sometimes the problem of your AC compressor not turning on will either involve costly repairs or be impossible to fix. Check the front of the compressor clutch. Put your ear to the vent and listen. 2004 Chevy Truck A/C compressor does not engage part 2 ScannerDanner 365K subscribers 203K views 5 years ago Here is a link to part 1 https://youtu. When the charge is just low you will normaly see the clutch cycle off & on, unless it is pretty much dead empty. Wiggled switch on compressor (could not get it to release, because I couldnt figure it out) Clutch will turn by hand,. AC Compressor Problems & Solutions. I usually install a set of pressure gauges that will read the high and the low side. Put the guage on the low port fitting and it said it was full. Here are a few more steps on how to test an AC pressure switch: 1. But overfilling usually causes one of three things to happen. 6 Signs Of A Bad AC Compressor Clutch. AC COMPRESSOR NOT ENGAGING NOT BLOWING COLD FIX. AC Clutch is Not Engaging>What You Should Do if Your AC Clutch is Not Engaging. 4 Symptoms Of A Bad AC Pressure Switch – High or Low. Car AC Compressor is Not Turning On and what to …. Here are 10 common reasons why the A/C compressor wont turn on. Solution: Replace the compressor. There are three reasons why the compressor clutch does not engage, especially if the sensor detects them. When a lack of pressure or an excessive amount of it is detected, this switch makes the compressor stop working. if you find the system is empty, I would suggest …. Take the fused jumper wire and connect its one end to that side of the wire connector that was connected to the compressor. Ask Your Own Medium and Heavy Trucks Question. Air Compressor Not Turning On – Is The Pressure Switch Faulty? Check the pressure witch if the air compressor motor won’t start. The easiest way to test it is to set the ignition to the On position, place your finger on the relay and activate the AC control switch. AC Compressor Problems & Solutions. The clutch will kick in if I put a jumper wire from 87 to 30 terminals on the AC relay but it wont work when I plug the relay back in. When this happens, the air may be stuck on or off, plus refrigerant can leak. Go out and wiggle the crap out of that connector. [1] Start with the fan speed turned to its highest setting. See the picture below of its wiring at the thermostat and at the furnace. Note that all air in the heating ventilation system is routed through the evaporator core. It can also be caused by a bad A/C pressure switch. Troubleshooting a Car Air Conditioner That Wont Turn On. A capacitor is an important part of your ac condenser unit because it powers your compressor and fan motor. A capacitor is an important part of your ac condenser unit because it powers your compressor and fan motor. Causes of an AC compressor not turning on Dirty condenser coil. Turning on the heater will draw excess heat through the heater core (a type of radiator), causing the engine coolants temperature to drop slightly. I am guessing you are running a conversion to 134a?. Most AC systems rely on a belt to churn the compressor and provide energy. Leave your cars hood open and turn on the engine. Any of these will cause this to occur. Below that, the A/C compressor should NOT be engaged. While your adding watch and make sure your engine fan still cycles. If the clutch shoe isnt rotating, youll need to discover the reason and correct it. Ask Your Own Medium and Heavy Trucks Question image. AC Might Not Be Working At All. Jump both pins with a paper clip on the electrical connector. A defective compressor capacitor could be why your ac compressor is not turning on. It can also be caused by a faulty high or low AC pressure switch, a blown fuse, a bad AC clutch or a bad electrical connection. Step 1: Turn on the AC. My cooling fans run at 100% when I cut the a/c on and stay on until I turn the truck off. The AC compressor. if the clutch kicks on, the switch is bad or system is empty. 4 Symptoms Of A Bad AC Pressure Switch. Why Is My Car AC Compressor Not Turning Off [Solved] 1. Bad A/C button or control module/head unit. How to Troubleshoot a Broken Car Air Conditioner. A/C compressor not engaging I have a 2013 5. Leave your cars hood open and turn on the engine. A dirty condenser coil will cause high head pressure in your AC, tripping the high pressure switch Dirty air filter. The first thing to do is to check the two fuses that control the ac compressor, fuses k11 and f7 in the fuse box under the hood. Hook the can up to the gauges, start it up with the AC on high and it didnt go as planned. If its not turning, theres a problem! First try to take the handle of a hammer and tap the hub in, if it pulls in then it needs to have a shim taken out fron under the hub. 1K 732K views 3 years ago Amazon Link. Leave your cars hood open and turn on the engine.