Pulley & mount about $75 on internet and a couple local mechanic to remove old & install new pulley. 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. 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. One of the first signs which is really to recognize … If you’re here, chances are you’ve tried to recharge your AC system and found a compressor clutch not engaging issue. See the link below for some pictures. 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. In some cases, a fuse would be blown or a breaker would be tripped. 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. 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. The pulley should turn all the time, with the belt, but the compressor only turns internally when the clutch engages. Also, the air conditioning stopped working about a month ago (I thought the freon just needed recharged, but I could've been wrong). The bearing in the clutch pulley is probably seized. AC compressor clutches receive power in a number of ways. Try turning the pulley with the car shut off. Replace belt or compressor/pulley issue? Moisture reacts with the refrigerant and oil to cause acid and sludge that can destroy the system. … I pulled the belt off and gave each a spin. Pumping liquid through a small hole is harder than pumping air. With the blower fan running, any liquid that enters the evaporator will boil and turn back into a gas. (When done properly) does a turbocharger improve or hinder gas mileage? But even then, it will only tell you if there’s some refrigerant in the system. The pulley and clutch can spin by hand. I have an old loud muffler that has holes in it and is rusted? 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. Some DIYers then hotwire the low pressure switch to force the compressor clutch to engage while they recharge. It is an ominous sign when the clutch engages but the compressor does not spin. After a few minutes, you may be able to build up enough pressure to close the low pressure switch. In most cases, their diagrams are right from the factory manuals. IF the pulley DOES spin but the clutch won't move (with the pliers) then you're looking at a new compressor. When the AC compressor goes bad in a vehicle, a consumer often will choose to install an AC bypass pulley. It won’t be under pressure since the compressor isn’t running. 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). Connect the recharging kit to the low pressure (suction) port. Or you could do what I did with the Jeep and buy the AC bypass pulley. The low pressure tubing is always a larger diameter than the high pressure line. Wiring varies by make, model, and year. 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. 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. Changing the compressor clutch could be the only solution in this case. They can activate through a relay that’s energized directly by a proper condition of the low and high pressure switches. The clutch is the outward most plate on the compressor, pulley is in the middle, and the coil is nearest to the 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! Stand in front of the AC compressor at the front of the engine. See if you can find a belt that will fit that just operates the power steering pump. Might as well leave the compressor in, It acts like an Idler pulley when not in use. The three components of a car’s air conditioning compressor clutch. You still use the stock belt when you do this. 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. If so, try the troubleshooting techniques described here. AC bypass pulleys are much cheaper than a new AC compressor. This prevents from engaging the whole mechanism when the AC is OFF. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. 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. NEVER try to bypass the low pressure switch. Not sure on the 2.5's. This is a full explanation of how the system works. A delay can cause serious damage to the air conditioning system and the engine. This may require special tools, and compressor removal, and has to be done properly, or the compressor will be damaged. 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. The compressor clutch air gap is critical to the AC compressor clutch engaging. The air compressor pulley rotates at all times when the engine of the car is working. BAD MOVE. 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. The radiator fans will cause the refrigerant to condense and turn back into a liquid. This is why I was thinking that there may be some kind of blockage. Will be getting a new pulley bearing for it and will re-install once the weather starts warming up again. The pressures developed will slowly fall off, leading to not so cold air. 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. I would think that a good compressor should turn also. If the pulley is the only part spinning, it means that the clutch is damaged, and the AC will not work properly. If this technique doesn’t work, take it to a shop. 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. Or, the relay can be operated by the PCM which has interpreted the condition of the low and high pressure sensors. Still have questions? Static low side pressure won’t give you any idea of system charge. 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 … Try turning the pulley with the car shut off. Then start adding refrigerant. When the A/C is turned on, the central portion will turn WITH the pulley signifying that the compressor is turning. The leak is large and should be repaired, because there’s probably air and moisture in the system. Turn the air conditioning controls to MAX AC and start the engine. The AC compressor pulley or compressor clutch has a bearing inside of it that enables the pulley to spin without the clutch being engaged. The clutch disc is splined to the  compressor shaft. The compressor does not turn with the motor running, the belt just slips around the pulley and is not burning as you would think. Just bought a 2000 Jeep Cherokee Sport cheap with that same problem. In both of these scenarios, you’d start the diagnosis by checking the compressor clutch fuse. First, turn ON the AC and fan to the maximum. Turn the air conditioning controls to MAX AC and start the engine. Do NOT hot wire the low pressure switch. The clutch can be replace w/o evacuation and re-charge of the refrigerant. Now look at the pulley of the air conditioner compressor. if the ac compressor pulley is not turning could that be related to the alternator going out 1 Answer. Plus, the DIY kit fitting will only attach to the low pressure port. Maybe you can just go without the a/c for now. To learn more about AC compressor clutch air gap, read this post. 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 try starting the engine and checking the compressor. Not sure what would cause the pulley to do this. 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. If the fuse is good, disconnect the electrical connector from the compressor clutch coil. An AC bypass pulley is a free spinning pulley used to replace the AC compressor on an automotive engine. When power energizes the clutch coil, the magnetic field pulls the clutch in towards the pulley. Turn the AC to MAX to start the radiator fans. You must log in or register to reply here. 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. Higher Temperatures Than Normal In The Cabin. Start the engine and let it warm up. I've checked the fuses and there still good. Best Regards, Wayne The noise is the clutch slipping against the pulley because the compressor is very hard to turn. This car is a 89 isuzu imark. NEVER! If you’re tracking down a wiring issue, Eautorepair.net is the better choice. I have a 96 mazda protege. Both the pulley and the clutch should be spinning. 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. That’s why car makers install a low pressure switch–to prevent the compressor from running if the system is low on refrigerant. Not really. Are the tires I bought good for the time being? Period. But chances are some of it will still reach the orifice tube and flow into the evaporator coil. 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. However, to read the high side pressure, you’ll need a manifold gauge set. 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. 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. But 1 ounce of refrigerant will provide a 50-psi reading the same as a full system. Reply to Thre You cold likely adjust that belt to stop the noise. They include wiring diagrams and technical service bulletins. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. Some cars (not Kia) can have a compressor bypass pulley installed & forget the compressor. 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. There is a way to add more refrigerant without hot wiring the low pressure switch and running the compressor. In some vehicles the compressor clutch relay is turned on and off by the low pressure switch and the evaporator temperature sensor. However, I’ve been around long enough to know you’ll try to recharge it against my advice. I took the clutch off and it was pretty shredded. If it worked well yesterday, unless the compressor grenades, it will slowly deteriorate if it is in fact failing. A bad AC compressor clutch needs immediate fixing. The noise was definitely a bearing sound. But if the system is low on refrigerant, the clutch will never engage. In a computer controlled system, the compressor clutch relay is grounded by the computer. 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. Some car makers trigger the relay control coil ground through the PCM or ECM. 50 MPH air conditioning os just fine. Losing the belt while commuting is far more expensive than simply replacing it. The a/c pump has seized but it would a little rare for the clutch to seize as well. One more thing, if I determine I can't fix this, could the car be driven without the air conditioning and power steering belt? 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. During startup the air conditioning/power steering belt has been squealing and screeching. If the clutch doesn’t engage, the air conditioning compressor can’t pump refrigerant. The idler pulley should spin whenever the car is running if the belt is properly tensioned. Then look at the front of the compressor clutch. That would be cheaper but you get what you pay for. 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. Let us now learn how to manually engage AC compressor clutch. As the clutch disc pulls in towards the pulley, the pulley provides the rotating power to operate the compressor. I bought a new one and installed it, but it isn't turning the compressor when engaged. What could be wrong with my air conditioning compressor? You could have a low side target range of 50-psi and see that static pressure on your gauge. Start the engine, and then look if the clutch and the pulley are running. Turn the air conditioning controls to MAX AC and start the engine. Until today the belt and pulley would still spin with the A/C on. The face of a compressor is comprised of a clutch, coil and pulley. It's only about 1 mile to the mechanic. Air conditioning compressor and clutch assembly. All that tells you is that there is some refrigerant in the system. 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. Then the system should be fully evacuated to remove all air before recharging. That means the clutch has properly engaged with the pulley. If such problems happen frequently, you need to have it checked by an electrician. 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. 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. Doing so will force the compressor to run with inadequate oil and can destroy the compressor. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. However, once installed the vehicle will no longer have air conditioning. Both the pulley and the clutch should be spinning. If you look at the center of the pulley, when the a/c is off, the central portion of the pulley should be stationary. But why would the compressor just now be seizing up? You can replace the AC compressor but that will cost a bit from an auto parts store. I turned it on high thinking maybe the light is burnt out, but nothing checked the compressor to see if maybe spinning regardless of the light and nope.nothing. If it is so loose as the idler pulley isn't spinning, than the belt and the AC compressor probably wouldn't spin … An AC clutch compressor is a type of compressor that derives its power from the car engine’s flywheel. Alldatadiy.com, on the other hand, uses the factory diagrams. Then look at the front of the compressor clutch. Both the pulley and the clutch should be spinning. Car makers use an electro-magnetic clutch to engage and disengage the air conditioning compressor. The center part (the clutch) should be engaged and should be spining along with the pulley. Easy fix in my Jeep not sure about a Protege though. Could try to find one in a bone-yard. 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. At that point you’re running the compressor with little to no oil. 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. 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. Not uncommon for an AC compressor to seize up like that. GOP lawmaker's death brings home reality of COVID-19, Jennifer Lopez responds to claims about her looks, Brady, Brees share special moment after playoff game, What to expect from Biden on student loans, Man lived inside airport for 3 months before detection, Trump chided Comey in newly revealed letter draft, Michelle Obama shows off her natural curls in birthday selfie, Mahomes scare offers stark reminder to Chiefs, A 'Major' celebration for Biden's history-making pooch, 'You are outnumbered': Stunning new Capitol video, Rebekah Jones in jail after Florida issues warrant. That means the clutch has properly engaged with the pulley. 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. When the clutch is engaged, the pulley … Be warned that I take no responsibility for any damage you cause by using this technique. IF the pulley will not spin, then the bearing is shot at the very least. To tell the a/c is on. Get your answers by asking now. You may get it to accept a charge, but you may have already damaged the compressor before the system reaches full charge. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. 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. Move it away from moving parts so you can safely check for power and ground. 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. After reading, go to this post to learn how to diagnose a compressor clutch problem. Turn the key to the RUN position and turn the blower fan to HI. The A/C compressor pulley wobbled and made noise when I spun it. It is slipping ever so slightly, but if the belt has 100K on it then replacing it is wise as it is due. With engine running and the AC set to MAX, use a digital voltmeter to check for battery voltage and good ground at the connector. 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. 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. So start your diagnosis by determining if the compressor clutch works. Now it’ll only spin when A/C is off. 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). At least the pulley will rotate. Can I cover the holes with tape to keep it working properly? Belt squealing when AC starts. 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 only the pulley is turning, but the clutch disc isn’t, there’s a problem somewhere in the system. 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? DIY recharging kits tell you to recharge through the low pressure port while the compressor is engaged. 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. Join Yahoo Answers and get 100 points today. I took the clutch being engaged professional-grade shop manuals—period Protege though I bought good the... Now be seizing up replace the AC is off disc isn ’,... Moisture in the system reaches full charge the radiator fans will cause the refrigerant evaporator boil! The first signs which is really to recognize … start the engine let! 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New compressor the component, splice and ground locations right in their diagrams 75. Each a spin really to recognize … start the radiator fans will cause refrigerant!