Belt squealing when AC starts. Move it away from moving parts so you can safely check for power and ground. With the blower fan running, any liquid that enters the evaporator will boil and turn back into a gas. It's only about 1 mile to the mechanic. … Maybe you can just go without the a/c for now. In both of these scenarios, you’d start the diagnosis by checking the compressor clutch fuse. 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. I bought a new one and installed it, but it isn't turning the compressor when engaged. This may require special tools, and compressor removal, and has to be done properly, or the compressor will be damaged. The pressures developed will slowly fall off, leading to not so cold air. 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. As the clutch disc pulls in towards the pulley, the pulley provides the rotating power to operate the compressor. Get your answers by asking now. An AC bypass pulley is a free spinning pulley used to replace the AC compressor on an automotive engine. Start the engine and let it warm up. (When done properly) does a turbocharger improve or hinder gas mileage? I have an old loud muffler that has holes in it and is rusted? Try turning the pulley with the car shut off. There is a way to add more refrigerant without hot wiring the low pressure switch and running the compressor. 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. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. 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. 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. The a/c pump has seized but it would a little rare for the clutch to seize as well. Then start adding refrigerant. If the clutch doesn’t engage, the problem could be a blown fuse, an open in the wire to the clutch coil, a bad clutch coil, a poor ground, or a low pressure lockout. 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. If such problems happen frequently, you need to have it checked by an electrician. NEVER! Both the pulley and the clutch should be spinning. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. Wiring varies by make, model, and year. The three components of a car’s air conditioning compressor clutch. 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. Still have questions? 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. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. If the fuse is good, disconnect the electrical connector from the compressor clutch coil. The clutch disc is splined to the  compressor shaft. IF the pulley DOES spin but the clutch won't move (with the pliers) then you're looking at a new compressor. One more thing, if I determine I can't fix this, could the car be driven without the air conditioning and power steering belt? Stand in front of the AC compressor at the front of the engine. If only the pulley is turning, but the clutch disc isn’t, there’s a problem somewhere in the system. Compressors have an external pulley that is connected to the drive belt, and an internal pulley that is linked to the compressor’s input shaft (compressor works by its rotation). You still use the stock belt when you do this. This is why I was thinking that there may be some kind of blockage. If the pulley is the only part spinning, it means that the clutch is damaged, and the AC will not work properly. They can activate through a relay that’s energized directly by a proper condition of the low and high pressure switches. 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But why would the compressor just now be seizing up? Turn the AC to MAX to start the radiator fans. If it worked well yesterday, unless the compressor grenades, it will slowly deteriorate if it is in fact failing. Turn the air conditioning controls to MAX AC and start the engine. 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. Some cars (not Kia) can have a compressor bypass pulley installed & forget the compressor. To tell the a/c is on. Static low side pressure won’t give you any idea of system charge. It won’t be under pressure since the compressor isn’t running. Pumping liquid through a small hole is harder than pumping air. Not sure what would cause the pulley to do this. What could be wrong with my air conditioning compressor? 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. 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. Or, the relay can be operated by the PCM which has interpreted the condition of the low and high pressure sensors. 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. Start the engine, and then look if the clutch and the pulley are running. Connect the recharging kit to the low pressure (suction) port. Turning off your car will cause the Freon to move from the high-pressure part of your AC compressor down to the side with lower pressure to equalize out. Turn the air conditioning controls to MAX AC and start the engine. The pulley should turn all the time, with the belt, but the compressor only turns internally when the clutch engages. The face of a compressor is comprised of a clutch, coil and pulley. I have a 96 mazda protege. Pulley & mount about $75 on internet and a couple local mechanic to remove old & install new pulley. 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. Not really. Just bought a 2000 Jeep Cherokee Sport cheap with that same problem. Some car makers trigger the relay control coil ground through the PCM or ECM. If you’re here, chances are you’ve tried to recharge your AC system and found a compressor clutch not engaging issue. Also, the air conditioning stopped working about a month ago (I thought the freon just needed recharged, but I could've been wrong). With engine running and the AC set to MAX, use a digital voltmeter to check for battery voltage and good ground at the connector. One of the first signs which is really to recognize … Join Yahoo Answers and get 100 points today. Then look at the front of the compressor clutch. The air compressor pulley rotates at all times when the engine of the car is working. Could try to find one in a bone-yard. Or you could do what I did with the Jeep and buy the AC bypass pulley. Not sure on the 2.5's. 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? AC bypass pulleys are much cheaper than a new AC compressor. A bad AC compressor clutch needs immediate fixing. See if you can find a belt that will fit that just operates the power steering pump. The clutch can be replace w/o evacuation and re-charge of the refrigerant. The noise is the clutch slipping against the pulley because the compressor is very hard to turn. That means the clutch has properly engaged with the pulley. The bearing in the clutch pulley is probably seized. 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. Now it’ll only spin when A/C is off. 50 MPH air conditioning os just fine. You could have a low side target range of 50-psi and see that static pressure on your gauge. You may get it to accept a charge, but you may have already damaged the compressor before the system reaches full charge. 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. Reply to Thre You cold likely adjust that belt to stop the noise. If the clutch doesn’t engage, the air conditioning compressor can’t pump refrigerant. But 1 ounce of refrigerant will provide a 50-psi reading the same as a full system. Well, today I started it up and the screeching was pretty bad and then smoke start coming out of the hood and I could smell burnt rubber, the belt snapped off and was laying on the ground (belt appeared to be in decent condition other than the fact that it was broken apart now). A static pressure taken on the high side is a slightly better indicator of system charge because the high side is much more responsive to ambient temperature than the low side. Best Regards, Wayne If you look at the center of the pulley, when the a/c is off, the central portion of the pulley should be stationary. 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. Will be getting a new pulley bearing for it and will re-install once the weather starts warming up again. Both the pulley and the clutch should be spinning. That means the clutch has properly engaged with the pulley. 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. 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. Turn the air conditioning controls to MAX AC and start the engine. Higher Temperatures Than Normal In The Cabin. This prevents from engaging the whole mechanism when the AC is OFF. Plus, the DIY kit fitting will only attach to the low pressure port. 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. If the pulley won't turn with the ignition off, then the a/c pump and clutch pulley have both frozen and you'll have to leave the belt off but it should be OK to drive a short distance. If it is so loose as the idler pulley isn't spinning, than the belt and the AC compressor probably wouldn't spin … NEVER try to bypass the low pressure switch. I pulled the belt off and gave each a spin. 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. When the A/C is turned on, the central portion will turn WITH the pulley signifying that the compressor is turning. 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. Losing the belt while commuting is far more expensive than simply replacing it. See the link below for some pictures. The AC compressor pulley or compressor clutch has a bearing inside of it that enables the pulley to spin without the clutch being engaged. At that point you’re running the compressor with little to no oil. In a computer controlled system, the compressor clutch relay is grounded by the computer. Being the clutch turns by hand, the cluch assembly, which will include a pulley, a clutch plate, and a coil, can be replaced, without replacing the entire compressor. When power energizes the clutch coil, the magnetic field pulls the clutch in towards the pulley. Be warned that I take no responsibility for any damage you cause by using this technique. Replace belt or compressor/pulley issue? So start your diagnosis by determining if the compressor clutch works. The leak is large and should be repaired, because there’s probably air and moisture in the system. To learn more about AC compressor clutch air gap, read this post. You can replace the AC compressor but that will cost a bit from an auto parts store. BAD MOVE. Not uncommon for an AC compressor to seize up like that. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesn’t any interior or exterior trim or body part removal. During startup the air conditioning/power steering belt has been squealing and screeching. At least the pulley will rotate. That’s why car makers install a low pressure switch–to prevent the compressor from running if the system is low on refrigerant. DIY kits come with a low pressure side gauge and they’re designed to provide a static pressure (engine not running or AC off) and a running pressure. After a few minutes, you may be able to build up enough pressure to close the low pressure switch. The low pressure tubing is always a larger diameter than the high pressure line. Alldatadiy.com, on the other hand, uses the factory diagrams. In some vehicles the compressor clutch relay is turned on and off by the low pressure switch and the evaporator temperature sensor. 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. However, once installed the vehicle will no longer have air conditioning. Until today the belt and pulley would still spin with the A/C on. I haven’t had a chance to put a wrench on the compressor bolt that holds the clutch to see if the compressor is frozen but will keep you posted. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. 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. If this technique doesn’t work, take it to a shop. Car makers use an electro-magnetic clutch to engage and disengage the air conditioning compressor. The compressor does not turn with the motor running, the belt just slips around the pulley and is not burning as you would think. So try starting the engine and checking the compressor. Moisture reacts with the refrigerant and oil to cause acid and sludge that can destroy the system. They include wiring diagrams and technical service bulletins. It is an ominous sign when the clutch engages but the compressor does not spin. 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. 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. I've checked the fuses and there still good. I would think that a good compressor should turn also. The a/c pump has seized but it would a little rare for the clutch to seize as well. 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… Can I cover the holes with tape to keep it working properly? Do NOT hot wire the low pressure switch. If so, try the troubleshooting techniques described here. Are the tires I bought good for the time being? 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. The compressor clutch air gap is critical to the AC compressor clutch engaging. Changing the compressor clutch could be the only solution in this case. 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. Period. The idler pulley should spin whenever the car is running if the belt is properly tensioned. if the ac compressor pulley is not turning could that be related to the alternator going out 1 Answer. But chances are some of it will still reach the orifice tube and flow into the evaporator coil. The center part (the clutch) should be engaged and should be spining along with the pulley. I took the clutch off and it was pretty shredded. Let us now learn how to manually engage AC compressor clutch. When the AC compressor goes bad in a vehicle, a consumer often will choose to install an AC bypass pulley. A delay can cause serious damage to the air conditioning system and the engine. An AC clutch compressor is a type of compressor that derives its power from the car engine’s flywheel. Some DIYers then hotwire the low pressure switch to force the compressor clutch to engage while they recharge. After reading, go to this post to learn how to diagnose a compressor clutch problem. 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