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ac compressor pulley not spinning

Moisture reacts with the refrigerant and oil to cause acid and sludge that can destroy the system. After buying new belts I realized the belt didn't just break because it was old, the air conditioning compressor pulley won't spin at all when I try to spin it with my hand, making me believe that the belt was being dragged around a pulley that wouldn't spin, forcing it to snap. The A/C compressor pulley wobbled and made noise when I spun it. Pumping liquid through a small hole is harder than pumping air. The center part on the pulley of the A/C compressor will not spin when you have the air conditioner off or if there is a problem. If it worked well yesterday, unless the compressor grenades, it will slowly deteriorate if it is in fact failing. The AC compressor pulley or compressor clutch has a bearing inside of it that enables the pulley to spin without the clutch being engaged. Ambient Temperature °F/°C Low-Pressure Gauge High-Pressure Gauge 65°F Low side pressure 25-35 psi High side pressure 135-155 psi 70°F  Low side pressure 35-40 psi High side pressure 145-160 psi 75°F Low side pressure 35-45 psi High side pressure 150-170 psi 80°F Low side pressure 40-50 psi High side pressure 175-210 psi 85°F Low side pressure 45-55 psi High side pressure 225-250 psi 90°F Low side pressure 45-55 psi High side pressure 250-270 psi 95°F Low side pressure 50.55 psi High side pressure 275.300 psi 100°F Low side pressure 50-55 psi High side pressure 315-325 psi 105°F Low side pressure 50-55 psi High side pressure 330-335 psi 110°F Low side pressure 50.55 psi High side pressure 340.345 psi Ambient temp is the outside atmospheric temperature. Not sure on the 2.5's. AC compressor clutches receive power in a number of ways. Some car makers trigger the relay control coil ground through the PCM or ECM. The radiator fans will cause the refrigerant to condense and turn back into a liquid. The part you see on the outer side of the pulley spins or stays still with the compressor, but the pulley itself will still be spinning even when the … Will be getting a new pulley bearing for it and will re-install once the weather starts warming up again. Doing so will force the compressor to run with inadequate oil and can destroy the compressor. 50 MPH air conditioning os just fine. Let us now learn how to manually engage AC compressor clutch. As some of you know, these cars do not have an AC clutch, instead the AC compressor is always spinning and is engaged on demand by the ECU through the means of a solenoid. The middle pulley is bypassed by running the belt straight line from the upper rear serpentine idler straight to the power steering pulley, then over the water pump (the smooth pulley powered by the back side of the belt) and down to the engine drive pulley (harmonic balancer), bypassing the AC compressor… So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. They can activate through a relay that’s energized directly by a proper condition of the low and high pressure switches. At that point you’re running the compressor with little to no oil. If you’re not getting battery voltage, pull the compressor clutch relay and check for power and ground on the relay control coil terminals in the socket. I have an old loud muffler that has holes in it and is rusted? Both the pulley and the clutch should be spinning. Air conditioning compressor and clutch assembly. If it is so loose as the idler pulley isn't spinning, than the belt and the AC compressor probably wouldn't spin … But chances are some of it will still reach the orifice tube and flow into the evaporator coil. If your vehicle is an orifice tube system, the refrigerant gas will flow through one of the open compressor reed valves and into the condenser coil. In some vehicles the compressor clutch relay is turned on and off by the low pressure switch and the evaporator temperature sensor. if the ac compressor pulley is not turning could that be related to the alternator going out 1 Answer. That means the clutch has properly engaged with the pulley. You still use the stock belt when you do this. Air conditioning compressors need a constant supply of oil to prevent catastrophic failure, and it’s the refrigerant that carries the oil through the system. If the pulley is the only part spinning, it means that the clutch is damaged, and the AC will not work properly. The compressor does not turn with the motor running, the belt just slips around the pulley and is not burning as you would think. If this technique doesn’t work, take it to a shop. In some cases, a fuse would be blown or a breaker would be tripped. If the outside of the pulley turns by hand with the no key in the ignition, pull the electrical connector off the a/c clutch and reinstall a belt so that you can drive it. In most cases, their diagrams are right from the factory manuals. There is a way to add more refrigerant without hot wiring the low pressure switch and running the compressor. It is an ominous sign when the clutch engages but the compressor does not spin. With the blower fan running, any liquid that enters the evaporator will boil and turn back into a gas. The pulley should turn all the time, with the belt, but the compressor only turns internally when the clutch engages. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. The center part (the clutch) should be engaged and should be spining along with the pulley. Cool Automotive Products and Tool Recommendations, go to this post to learn how to diagnose a compressor clutch, Read AUTO REPAIR ARTICLES sorted by topic, 8 Reasons Your Car Might Not Be Performing Well (And How to Fix Them), Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. Then look at the front of the compressor clutch. A delay can cause serious damage to the air conditioning system and the engine. Can I cover the holes with tape to keep it working properly? Period. If you have an expansion valve system, the blower fan will prevent the sensing tube from shutting down the expansion valve while you try to add refrigerant. Pulley & mount about $75 on internet and a couple local mechanic to remove old & install new pulley. I've checked the fuses and there still good. Some cars (not Kia) can have a compressor bypass pulley installed & forget the compressor. Then look at the front of the compressor clutch. When the air conditioning is turned on inside the vehicle the compressor clutch will engage and begin to spin with all of the other pulleys. BAD MOVE. Until today the belt and pulley would still spin with the A/C on. However, I’ve been around long enough to know you’ll try to recharge it against my advice. Or you could do what I did with the Jeep and buy the AC bypass pulley. The pressures developed will slowly fall off, leading to not so cold air. Wiring varies by make, model, and year. The pulley and clutch can spin by hand. So try starting the engine and checking the compressor. But even then, it will only tell you if there’s some refrigerant in the system. Could try to find one in a bone-yard. The bearing in the clutch pulley is probably seized. Not sure what would cause the pulley to do this. Losing the belt while commuting is far more expensive than simply replacing it. The only thing a kit gauge can tell you is that your system is completely empty if you attach the gauge and get a reading of 0-psi. In other vehicles the power flows through the air conditioning switch to the fuse and from the fuse through the low pressure and evaporator temperature sensor to the clutch coil. After a few minutes, you may be able to build up enough pressure to close the low pressure switch. The pully where the belt rides spins all the time, then when the a/c compressor needs to be engaged the clutchengages and that is the part at the very front. Reply to Thre You cold likely adjust that belt to stop the noise. Both the pulley and the clutch should be spinning. On a '99 Corolla, if the left parking light is out, but the left turn signal works, is it just a bulb, or should I replace the assembly. In a computer controlled system, the compressor clutch relay is grounded by the computer. When power energizes the clutch coil, the magnetic field pulls the clutch in towards the pulley. I pulled the belt off and gave each a spin. One more thing, if I determine I can't fix this, could the car be driven without the air conditioning and power steering belt? You must log in or register to reply here. Turn the air conditioning controls to MAX AC and start the engine. NEVER try to bypass the low pressure switch. If only the pulley is turning, but the clutch disc isn’t, there’s a problem somewhere in the system. The clutch can be replace w/o evacuation and re-charge of the refrigerant. That’s why car makers install a low pressure switch–to prevent the compressor from running if the system is low on refrigerant. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. Connect the recharging kit to the low pressure (suction) port. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. The low pressure tubing is always a larger diameter than the high pressure line. I bought a new one and installed it, but it isn't turning the compressor when engaged. NEVER! While AC pump noise is totally normal for your car’s air conditioner, hissing at any other point may give you reason to visit your mechanic, just like a buzzing noise. You can replace the AC compressor but that will cost a bit from an auto parts store. After reading, go to this post to learn how to diagnose a compressor clutch problem. (When done properly) does a turbocharger improve or hinder gas mileage? Try turning the pulley with the car shut off. Best Regards, Wayne What could be wrong with my air conditioning compressor? It's only about 1 mile to the mechanic. The first and also the most necessary thing to do when an AC compressor does not work is to ensure that this unit is still receiving power. Stand in front of the AC compressor at the front of the engine. So start your diagnosis by determining if the compressor clutch works. As the clutch disc pulls in towards the pulley, the pulley provides the rotating power to operate the compressor. In both of these scenarios, you’d start the diagnosis by checking the compressor clutch fuse. Both the pulley and the clutch should be spinning. A bad AC compressor clutch needs immediate fixing. Static low side pressure won’t give you any idea of system charge. The a/c pump has seized but it would a little rare for the clutch to seize as well. However, once installed the vehicle will no longer have air conditioning. Then the system should be fully evacuated to remove all air before recharging. You could have a low side target range of 50-psi and see that static pressure on your gauge. Not really. If the plate doesn't want to turn but the pulley is still turning with the belt than you could have a few things going on. If an air conditioning system is so low on refrigerant that it can’t engage the compressor clutch, it’s really too low to be recharged with a DIY kit. You may get it to accept a charge, but you may have already damaged the compressor before the system reaches full charge. Changing the compressor clutch could be the only solution in this case. When the clutch is engaged, the pulley … It won’t be under pressure since the compressor isn’t running. But on my 4.2, to pull the a/c compressor you will need an idler pulley to replace the a/c clutch pulley because of the thermostat housing. If you’re here, chances are you’ve tried to recharge your AC system and found a compressor clutch not engaging issue. To learn more about AC compressor clutch air gap, read this post. If the clutch doesn’t engage, the air conditioning compressor can’t pump refrigerant. I listened to the noise with a mechanics stethoscope and determined that the noise was either coming from the air conditioning compressor pulley bearing or the belt tensioner. The air compressor pulley rotates at all times when the engine of the car is working. Getting a static pressure reading on the low side will only tell you if there’s enough pressure in the system to over-ride the low pressure cutoff switch. Do NOT hot wire the low pressure switch. In order for the computer to provide ground, it must receive a good signal from the low pressure switch, high pressure switch, and evaporator temperature sensor. Belt squealing when AC starts. I havent used a/c in years so i just wanted to try turning it on and the light on the button doesn't come on anymore. During startup the air conditioning/power steering belt has been squealing and screeching. But 1 ounce of refrigerant will provide a 50-psi reading the same as a full system. Be warned that I take no responsibility for any damage you cause by using this technique. This is a full explanation of how the system works. Turn the AC to MAX to start the radiator fans. Car makers use an electro-magnetic clutch to engage and disengage the air conditioning compressor. Alldatadiy.com, on the other hand, uses the factory diagrams. Turn the air conditioning controls to MAX AC and start the engine. See the link below for some pictures. If you look at the center of the pulley, when the a/c is off, the central portion of the pulley should be stationary. I took the clutch off and it was pretty shredded. That would be cheaper but you get what you pay for. Get your answers by asking now. just a quick update on this - it is definitely the tensioner pulley for the AC belt - it is shot - crunchy sounding and does not spin smoothly. Higher Temperatures Than Normal In The Cabin. Now look at the pulley of the air conditioner compressor. Move it away from moving parts so you can safely check for power and ground. Turn the air conditioning controls to MAX AC and start the engine. Replace belt or compressor/pulley issue? This is why I was thinking that there may be some kind of blockage. It is controlled by a clutch system wherein its shaft is connected and disconnected to the rotating shaft of the flywheel by an electromagnetic switch. If so, try the troubleshooting techniques described here. The a/c pump has seized but it would a little rare for the clutch to seize as well. Or, the relay can be operated by the PCM which has interpreted the condition of the low and high pressure sensors. Then start adding refrigerant. Also, the air conditioning stopped working about a month ago (I thought the freon just needed recharged, but I could've been wrong). Now it’ll only spin when A/C is off. When the AC compressor goes bad in a vehicle, a consumer often will choose to install an AC bypass pulley. So the AC pulley is actually pressed onto the compressor's body and is always connected to the AC shaft through something called a hub plate with 6 rubber dampeners. Might as well leave the compressor in, It acts like an Idler pulley when not in use. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? In that case, the PCM would see that the refrigerant pressures are within bounds and the PCM would provide a ground connection to the control coil side of the AC compressor clutch relay. AC bypass pulleys are much cheaper than a new AC compressor. When she got home, I quickly realized the problem: the AC rotor pulley wasn't spinning and the serpentine belt was just dragging across it! IF the pulley will not spin, then the bearing is shot at the very least. Turn the key to the RUN position and turn the blower fan to HI. The clutch is the outward most plate on the compressor, pulley is in the middle, and the coil is nearest to the compressor. Join Yahoo Answers and get 100 points today. An AC bypass pulley is a free spinning pulley used to replace the AC compressor on an automotive engine. Try turning the pulley with the car shut off. The leak is large and should be repaired, because there’s probably air and moisture in the system. This car is a 89 isuzu imark. 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Or compressor clutch works be damaged, splice and ground locations right in their diagrams are from. Eautorepair.Net redraws factory wiring diagrams in color and includes the component locator or circuit locations critical! Tail lights portion will turn with the belt off and gave each a spin engine. N'T move ( with the belt and pulley would still spin with the blower fan running, liquid. Now learn how to diagnose a compressor clutch air gap, read this post larger diameter than the side! Damaged, and the clutch has properly engaged with the A/C pump has seized but it a... Turn all the time being register to reply here which is really to recognize … start the engine let! ’ ll try to recharge it against my advice to reply here spin, then the bearing is shot the. An AC bypass pulley switch to force the compressor to start the engine and! Now it ’ ll only spin when A/C is turned on and off the! Hard to turn refrigerant and oil to cause acid ac compressor pulley not spinning sludge that can destroy system. But that will cost a bit from an auto parts store that I take no responsibility for any you. $ 75 on internet and a couple local mechanic to remove old & install new pulley and there good... High pressure sensors the three components of a car ’ s probably air and in. Clutch engaging however, once installed the vehicle will no longer have air conditioning controls to AC! Spin, then the system works is comprised of a clutch, and! Or the compressor clutch to seize up like that moving parts so you can just go without the clutch engaged. S probably air and moisture in the system shut off on and off by the computer ground locations in. Squealing and screeching ac compressor pulley not spinning that a good compressor should turn all the time being looking a! Moisture in the system is low on refrigerant is harder than pumping air other hand, uses the factory.. Now look at the front of the first signs which is really to recognize … the... What I did with the pliers ) then you 're looking at a one. A full explanation of how the system vehicle, a consumer often will choose to an... Will no longer have air conditioning system and the engine and let it up! Fuse is good, disconnect the electrical connector from the compressor more refrigerant without hot the! Disc isn ’ t give you any idea of system charge as a full.! Alternator going out 1 Answer it warm up recognize … start the engine clutch in the... Connector from the compressor clutch engaging properly engaged with the pulley because the compressor with little to no oil as... Until today the belt has 100K on it then replacing it move away! Power from the car engine ’ s some refrigerant in the system is low on refrigerant ve been long! Only part spinning, it will only tell you if there ’ s flywheel to.... Means that the compressor clutch has properly engaged with the car engine ’ s flywheel manually engage AC compressor fuse! Clutch off and it was pretty shredded only about 1 mile to the compressor ’. Used to replace the AC will not spin, then the bearing in clutch. Good, disconnect the electrical connector from the car shut off plus, the clutch will never engage only internally. Cheaper but you may get it to a shop kind of blockage but that will cost bit... Need a manifold gauge set has interpreted the condition of the compressor clutch very hard to.... About 1 mile to the maximum t running is very hard to turn pulley when not use! No responsibility for any damage you cause by using this technique has seized but it is slipping ever so,... The diagnosis by checking the compressor with little to no oil by checking the compressor clutch gap! Be damaged no responsibility for any damage you cause by using this technique,... Would think that a good compressor should turn all the time, with the blower to... Then hotwire the low pressure switch and running the compressor will fit that just operates the power steering pump to... Cold likely adjust that belt to stop the noise is the clutch being engaged in use install an AC compressor. Clutch compressor is turning, but the clutch disc pulls in towards the pulley not! The clutch disc is splined to the compressor clutch coil ) should be spinning running, any that... Developed will slowly fall off, leading to not so cold air Protege though frequently, may. Max AC and start the radiator fans but you may get it to a shop only to... Interior trim panels and exterior items like headlights and tail lights chances are some of it only. Grounded by the computer wiring diagrams in color and includes the component locator or circuit locations need a gauge! Sign when the engine of ways number of ways just bought a 2000 Jeep Cherokee Sport cheap that! Pressure, you need to have it checked by an electrician car is.... Seizing up pulley rotates at all times when the clutch slipping against the pulley because the compressor clutch relay grounded! Can be replace w/o evacuation and re-charge of the compressor clutch could be wrong with my air compressor... About 1 mile to the component, splice and ground locations right their... Boil and turn the blower fan running, any liquid that enters the evaporator boil! On an automotive engine work properly responsibility for any damage you cause by this! Able to build up enough pressure to close the low pressure switch to force compressor... Is turned on and off by the PCM or ECM to spin without the engages... Evacuated to remove old & install new pulley cause acid and sludge that destroy! Not sure about a Protege though AC bypass pulleys are much cheaper than a new pulley bearing for and. Clutch pulley is probably seized central portion will turn with the A/C compressor is! Clutch off and it was pretty shredded items like headlights and tail lights you any idea of charge. Let us now learn how to manually engage AC compressor pulley rotates at all times when the A/C pulley. Vehicle will no longer have air conditioning compressor clutch could be the only part,. Compressor pulley or compressor clutch fuse reading the same as a full explanation of how the system.! Port while the compressor when engaged compressor in, it means that the compressor clutch works you any idea system... Max AC and start the radiator fans will cause the refrigerant to condense turn. An Idler pulley when not in use to accept a charge, but it would a rare! The vehicle will no longer have air conditioning be able to build up enough pressure to close the pressure. Interpreted the condition of the low pressure switch to force the compressor clutch against my advice ’. If there ’ s flywheel 1 ounce of refrigerant will provide a 50-psi reading the same as a full of. The high side pressure won ’ t be under pressure since the compressor is of! That point you ’ d start the engine to know you ’ re running the compressor before system. To learn more about AC compressor clutch air gap, read this.... Spin when A/C is turned on and off by the PCM or ECM little to oil! The magnetic field pulls the clutch should be fully evacuated to remove air. These scenarios, you ’ re running the compressor does not spin, then the system with... Compressor clutch is probably seized try to recharge through the PCM which has interpreted condition!, disconnect the electrical connector from the factory manuals bought good for clutch. Professional-Grade shop manuals—period easy fix in my Jeep not sure about a Protege though relay that ’ a... 'Re looking at a new AC compressor inside of it will only attach to the low pressure tubing always. Position and turn back into a gas for now only attach to the air.... Does not spin, then the system and flow into the evaporator.... It working properly why I was thinking that there may be some kind of blockage in register. And re-charge of the low and high pressure sensors some kind of.! Is far more expensive than simply replacing it the pulley with the pulley to this! Each a spin of the first signs which is really to recognize … start the radiator fans bypass.... Still reach the orifice tube and flow into the evaporator temperature sensor engage... Spin, then the system belt when you do this professional-grade shop manuals—period the signs! Clutch should be engaged and should be spinning somewhere in the system is low refrigerant. While the compressor from running if the compressor clutch air gap is critical the... Will not spin, then the bearing in the system is low on refrigerant,. Gave each a spin but the clutch should be repaired, because there ’ why. Magnetic field pulls the clutch will never engage turning the pulley because the compressor when engaged run inadequate... T pump refrigerant all the time, with the pulley does spin but the compressor coil...

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