Also, the air conditioning stopped working about a month ago (I thought the freon just needed recharged, but I could've been wrong). 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! I've checked the fuses and there still good. 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. 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. I pulled the belt off and gave each a spin. But why would the compressor just now be seizing up? I bought a new one and installed it, but it isn't turning the compressor when engaged. Still have questions? If you’re here, chances are you’ve tried to recharge your AC system and found a compressor clutch not engaging issue. As the clutch disc pulls in towards the pulley, the pulley provides the rotating power to operate the compressor. 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. Doing so will force the compressor to run with inadequate oil and can destroy the compressor. 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. Join Yahoo Answers and get 100 points today. In a computer controlled system, the compressor clutch relay is grounded by the computer. After a few minutes, you may be able to build up enough pressure to close the low pressure switch. 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. The noise was definitely a bearing sound. If it is so loose as the idler pulley isn't spinning, than the belt and the AC compressor probably wouldn't spin … Turn the AC to MAX to start the radiator fans. What could be wrong with my air conditioning compressor? Reply to Thre You cold likely adjust that belt to stop the noise. Belt squealing when AC starts. 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. They include wiring diagrams and technical service bulletins. The clutch can be replace w/o evacuation and re-charge of the refrigerant. 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. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. The a/c pump has seized but it would a little rare for the clutch to seize as well. First, turn ON the AC and fan to the maximum. The radiator fans will cause the refrigerant to condense and turn back into a liquid. Higher Temperatures Than Normal In The Cabin. Turn the air conditioning controls to MAX AC and start the engine. But chances are some of it will still reach the orifice tube and flow into the evaporator coil. To tell the a/c is on. If the pulley is the only part spinning, it means that the clutch is damaged, and the AC will not work properly. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. An AC bypass pulley is a free spinning pulley used to replace the AC compressor on an automotive engine. If the fuse is good, disconnect the electrical connector from the compressor clutch coil. With the blower fan running, any liquid that enters the evaporator will boil and turn back into a gas. I took the clutch off and it was pretty shredded. The a/c pump has seized but it would a little rare for the clutch to seize as well. The air compressor pulley rotates at all times when the engine of the car is working. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. To learn more about AC compressor clutch air gap, read this post. I would think that a good compressor should turn also. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. You can replace the AC compressor but that will cost a bit from an auto parts store. Losing the belt while commuting is far more expensive than simply replacing it. If it worked well yesterday, unless the compressor grenades, it will slowly deteriorate if it is in fact failing. So try starting the engine and checking the compressor. It's only about 1 mile to the mechanic. This car is a 89 isuzu imark. 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). But even then, it will only tell you if there’s some refrigerant in the system. Connect the recharging kit to the low pressure (suction) port. An AC clutch compressor is a type of compressor that derives its power from the car engine’s flywheel. Get your answers by asking now. 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. Just bought a 2000 Jeep Cherokee Sport cheap with that same problem. The leak is large and should be repaired, because there’s probably air and moisture in the system. That means the clutch has properly engaged with the pulley. The bearing in the clutch pulley is probably seized. DIY recharging kits tell you to recharge through the low pressure port while the compressor is engaged. Move it away from moving parts so you can safely check for power and ground. 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. All that tells you is that there is some refrigerant in the system. Turn the air conditioning controls to MAX AC and start the engine. 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. They can activate through a relay that’s energized directly by a proper condition of the low and high pressure switches. The compressor clutch air gap is critical to the AC compressor clutch engaging. 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. Try turning the pulley with the car shut off. Best Regards, Wayne At that point you’re running the compressor with little to no oil. Start the engine, and then look if the clutch and the pulley are running. In most cases, their diagrams are right from the factory manuals. Pumping liquid through a small hole is harder than pumping air. There is a way to add more refrigerant without hot wiring the low pressure switch and running the compressor. Period. 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. Not sure what would cause the pulley to do this. The three components of a car’s air conditioning compressor clutch. 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. Both the pulley and the clutch should be spinning. But 1 ounce of refrigerant will provide a 50-psi reading the same as a full system. Or, the relay can be operated by the PCM which has interpreted the condition of the low and high pressure sensors. Could try to find one in a bone-yard. If the clutch doesn’t engage, the air conditioning compressor can’t pump refrigerant. 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. Pulley & mount about $75 on internet and a couple local mechanic to remove old & install new pulley. 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. AC bypass pulleys are much cheaper than a new AC compressor. Can I cover the holes with tape to keep it working properly? Both the pulley and the clutch should be spinning. So start your diagnosis by determining if the compressor clutch works. A bad AC compressor clutch needs immediate fixing. If such problems happen frequently, you need to have it checked by an electrician. 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. Let us now learn how to manually engage AC compressor clutch. 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. 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 … Start the engine and let it warm up. When the A/C is turned on, the central portion will turn WITH the pulley signifying that the compressor is turning. Are the tires I bought good for the time being? Plus, the DIY kit fitting will only attach to the low pressure port. That’s why car makers install a low pressure switch–to prevent the compressor from running if the system is low on refrigerant. You still use the stock belt when you do this. If this technique doesn’t work, take it to a shop. Not really. 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. However, to read the high side pressure, you’ll need a manifold gauge set. In some cases, a fuse would be blown or a breaker would be tripped. The center part (the clutch) should be engaged and should be spining along with the pulley. 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. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. Then start adding refrigerant. 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 DOES spin but the clutch won't move (with the pliers) then you're looking at a new compressor. I have a 96 mazda protege. Some car makers trigger the relay control coil ground through the PCM or ECM. Then look at the front of the compressor clutch. This is a full explanation of how the system works. Some DIYers then hotwire the low pressure switch to force the compressor clutch to engage while they recharge. … Be warned that I take no responsibility for any damage you cause by using this technique. 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 … At least the pulley will rotate. 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. Both the pulley and the clutch should be spinning. See if you can find a belt that will fit that just operates the power steering pump. It won’t be under pressure since the compressor isn’t running. Do NOT hot wire the low pressure switch. Easy fix in my Jeep not sure about a Protege though. 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. When the AC compressor goes bad in a vehicle, a consumer often will choose to install an AC bypass pulley. That would be cheaper but you get what you pay for. If only the pulley is turning, but the clutch disc isn’t, there’s a problem somewhere in the system. 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. Then look at the front of the compressor clutch. You must log in or register to reply here. Maybe you can just go without the a/c for now. However, once installed the vehicle will no longer have air conditioning. The AC compressor pulley or compressor clutch has a bearing inside of it that enables the pulley to spin without the clutch being engaged. Not uncommon for an AC compressor to seize up like that. 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… NEVER! The noise is the clutch slipping against the pulley because the compressor is very hard to turn. Changing the compressor clutch could be the only solution in this case. If so, try the troubleshooting techniques described here. Replace belt or compressor/pulley issue? It is slipping ever so slightly, but if the belt has 100K on it then replacing it is wise as it is due. 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. Turn the air conditioning controls to MAX AC and start the engine. The idler pulley should spin whenever the car is running if the belt is properly tensioned. Try turning the pulley with the car shut off. This is why I was thinking that there may be some kind of blockage. 50 MPH air conditioning os just fine. 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 power energizes the clutch coil, the magnetic field pulls the clutch in towards the pulley. BAD MOVE. A delay can cause serious damage to the air conditioning system and the engine. IF the pulley will not spin, then the bearing is shot at the very least. 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? Might as well leave the compressor in, It acts like an Idler pulley when not in use. The pulley should turn all the time, with the belt, but the compressor only turns internally when the clutch engages. The clutch disc is splined to the compressor shaft. Or you could do what I did with the Jeep and buy the AC bypass pulley. 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. During startup the air conditioning/power steering belt has been squealing and screeching. Now it’ll only spin when A/C is off. 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 clutch is engaged, the pulley … Stand in front of the AC compressor at the front of the engine. Then look at the front of the compressor clutch. However, I’ve been around long enough to know you’ll try to recharge it against my advice. Will be getting a new pulley bearing for it and will re-install once the weather starts warming up again. 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). NEVER try to bypass the low pressure switch. One more thing, if I determine I can't fix this, could the car be driven without the air conditioning and power steering belt? The A/C compressor pulley wobbled and made noise when I spun it. 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. Not sure on the 2.5's. 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. 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The pulley and clutch can spin by hand.
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