Plus, the DIY kit fitting will only attach to the low pressure port. 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). 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 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. The pressures developed will slowly fall off, leading to not so cold air. If it worked well yesterday, unless the compressor grenades, it will slowly deteriorate if it is in fact failing. 50 MPH air conditioning os just fine. Be warned that I take no responsibility for any damage you cause by using this technique. If this technique doesn’t work, take it to a shop. Can I cover the holes with tape to keep it working properly? 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! What could be wrong with my air conditioning compressor? The clutch can be replace w/o evacuation and re-charge of the refrigerant. Let us now learn how to manually engage AC compressor clutch. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. 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. So start your diagnosis by determining if the compressor clutch works. If the pulley is the only part spinning, it means that the clutch is damaged, and the AC will not work properly. If you look at the center of the pulley, when the a/c is off, the central portion of the pulley should be stationary. The center part (the clutch) should be engaged and should be spining along with the pulley. Car makers use an electro-magnetic clutch to engage and disengage the air conditioning compressor. if the ac compressor pulley is not turning could that be related to the alternator going out 1 Answer. The bearing in the clutch pulley is probably seized. (When done properly) does a turbocharger improve or hinder gas mileage? In most cases, their diagrams are right from the factory manuals. Turn the air conditioning controls to MAX AC and start the engine. 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 the pulley will not spin, then the bearing is shot at the very least. I have an old loud muffler that has holes in it and is rusted? The noise was definitely a bearing sound. Not sure what would cause the pulley to do this. You must log in or register to reply here. It is slipping ever so slightly, but if the belt has 100K on it then replacing it is wise as it is due. That would be cheaper but you get what you pay for. During startup the air conditioning/power steering belt has been squealing and screeching. Are the tires I bought good for the time being? However, I’ve been around long enough to know you’ll try to recharge it against my advice. Both the pulley and the clutch should be spinning. 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 plate doesn't want to turn but the pulley is still turning with the belt than you could have a few things going on. 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. After reading, go to this post to learn how to diagnose a compressor clutch problem. A bad AC compressor clutch needs immediate fixing. AC bypass pulleys are much cheaper than a new AC compressor. Or, the relay can be operated by the PCM which has interpreted the condition of the low and high pressure sensors. But even then, it will only tell you if there’s some refrigerant in the system. The AC compressor pulley or compressor clutch has a bearing inside of it that enables the pulley to spin without the clutch being engaged. If you’re here, chances are you’ve tried to recharge your AC system and found a compressor clutch not engaging issue. The leak is large and should be repaired, because there’s probably air and moisture in the system. There is a way to add more refrigerant without hot wiring the low pressure switch and running the compressor. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. Both the pulley and the clutch should be spinning. That’s why car makers install a low pressure switch–to prevent the compressor from running if the system is low on refrigerant. I bought a new one and installed it, but it isn't turning the compressor when engaged. 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. In some cases, a fuse would be blown or a breaker would be tripped. Period. However, to read the high side pressure, you’ll need a manifold gauge set. One more thing, if I determine I can't fix this, could the car be driven without the air conditioning and power steering belt? When power energizes the clutch coil, the magnetic field pulls the clutch in towards the pulley. I've checked the fuses and there still good. Changing the compressor clutch could be the only solution in this case. However, once installed the vehicle will no longer have air conditioning. In a computer controlled system, the compressor clutch relay is grounded by the computer. But chances are some of it will still reach the orifice tube and flow into the evaporator coil. 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 took the clutch off and it was pretty shredded. 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. It's only about 1 mile to the mechanic. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. To tell the a/c is on. I have a 96 mazda protege. The a/c pump has seized but it would a little rare for the clutch to seize as well. Just bought a 2000 Jeep Cherokee Sport cheap with that same problem. At least the pulley will rotate. 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. As the clutch disc pulls in towards the pulley, the pulley provides the rotating power to operate the compressor. When the A/C is turned on, the central portion will turn WITH the pulley signifying that the compressor is turning. Turn the AC to MAX to start the radiator fans. 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. 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. The compressor does not turn with the motor running, the belt just slips around the pulley and is not burning as you would think. The noise is the clutch slipping against the pulley because the compressor is very hard to turn. Then start adding refrigerant. Higher Temperatures Than Normal In The Cabin. Turn the air conditioning controls to MAX AC and start the engine. 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. 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. 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The pulley should turn all the time, with the belt, but the compressor only turns internally when the clutch engages. IF the pulley DOES spin but the clutch won't move (with the pliers) then you're looking at a new compressor. Join Yahoo Answers and get 100 points today. But if the system is low on refrigerant, the clutch will never engage. The idler pulley should spin whenever the car is running if the belt is properly tensioned. An AC clutch compressor is a type of compressor that derives its power from the car engine’s flywheel. 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. See the link below for some pictures. In both of these scenarios, you’d start the diagnosis by checking the compressor clutch fuse. It won’t be under pressure since the compressor isn’t running. This is a full explanation of how the system works. If the clutch doesn’t engage, the air conditioning compressor can’t pump refrigerant. Connect the recharging kit to the low pressure (suction) port. 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. 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). Still have questions? Pulley & mount about $75 on internet and a couple local mechanic to remove old & install new pulley. That means the clutch has properly engaged with the pulley. The pulley and clutch can spin by hand. DIY recharging kits tell you to recharge through the low pressure port while the compressor is engaged. 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? NEVER! … 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. One of the first signs which is really to recognize … They include wiring diagrams and technical service bulletins. The low pressure tubing is always a larger diameter than the high pressure line. Start the engine and let it warm up. Then look at the front of the compressor clutch. The clutch is the outward most plate on the compressor, pulley is in the middle, and the coil is nearest to the compressor. When the AC compressor goes bad in a vehicle, a consumer often will choose to install an AC bypass pulley. This is why I was thinking that there may be some kind of blockage. Could try to find one in a bone-yard. Then look at the front of the compressor clutch. Move it away from moving parts so you can safely check for power and ground. Static low side pressure won’t give you any idea of system charge. 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. 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. A delay can cause serious damage to the air conditioning system and the engine. If the fuse is good, disconnect the electrical connector from the compressor clutch coil. The a/c pump has seized but it would a little rare for the clutch to seize as well. Then look at the front of the compressor clutch. Belt squealing when AC starts. This car is a 89 isuzu imark. Will be getting a new pulley bearing for it and will re-install once the weather starts warming up again. 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. First, turn ON the AC and fan to the maximum. 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. Air conditioning compressor and clutch assembly. Maybe you can just go without the a/c for now. Do NOT hot wire the low pressure switch. Stand in front of the AC compressor at the front of the engine. Not uncommon for an AC compressor to seize up like that. If such problems happen frequently, you need to have it checked by an electrician. The A/C compressor pulley wobbled and made noise when I spun it. 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. Alldatadiy.com, on the other hand, uses the factory diagrams. All that tells you is that there is some refrigerant in the system. AC compressor clutches receive power in a number of ways. Moisture reacts with the refrigerant and oil to cause acid and sludge that can destroy the system. 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. 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. If it is so loose as the idler pulley isn't spinning, than the belt and the AC compressor probably wouldn't spin … If so, try the troubleshooting techniques described here. I pulled the belt off and gave each a spin. 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