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Trouble shoot lack of power to AC clutch - Camry Toyota Cars & Trucks

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Broken wire to it, or upper or lower pressure switch preventing power going to AC Clutch.

Usually, lack of power to it is due to a low refrigerant r134a charge in the system. Add a can or two of refrigerant should rectify this problem, assuming there are no leaks in the a/c hoses or compressor.

Posted on Aug 01, 2010


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The #1 reason an AC clutch doesn't engage is that the AC system has lost its refrigerant from a leak.

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Be carefule of hot parts and rotating/moving belts and pulleys.

If its a whine, most likely the bearings on the idler pulley or the bearings on the ac compressor clutch.
-To trouble shoot with engine running and ac on spray wd40 on bearing area of clutch then wait a few seconds to see if sound goes away. If not then try bearing area(behind bolt of pulley) of idler. This will work as temporay fix, but ultimatly you must replace bad bearing.Do NOT spray on belt or pulley surface.

If its a squeal could be the belt is loose and needs to be replaced or dressed.
-Belt dressing can be spray directly on belt while engine is running and ac is on.

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How to trouble shoot air condition compresuer

You really want to troubleshoot your AC. Here are some items to follow:
1- Make sure your Compressor clutch work first. You can jump the wire to test it when the engine is off.
When you know the clutch work then you can look for the other things not makeing it activated.
2- It it doesn't work then you know the problem right there.
3- If it works then check the Low and high pressure according to compressor spec.
3- Check your engine temperature sensor. Don't think that your temp reading gauge is coorect then your engine temperature for your AC is working.
4- Check your compressor sensor speed. It has to be in sych with your crankshaft sensor before it allows the clutch engaged to prevent burning your compressor when it is locked up is in freezing mode ( case some clever people jumping wire to control the clutch bypassing all other rerquirement).
5- If you think these items need to be addressed by professional better then do-it yourself then I have no objection. Good luck on trying.

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there must be a faulty wiring in your airconditioning system, try to see an aircon technician for trouble shooting

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I recharged ac no cold air

There is an over pressure protection switch that could be at cause and there is an under pressure protection switch that might be at cause and there is also the on/off pressure switch located on the dryer canister that actually controls the temperature of your evaporator that might be just plain wore out. Last I remember NAPA wouldn't even stock these as they wear out within a month of use and just quit like your situation. My solution to that is to hot wire them on with a section of bare copper wire within the plug assembly - cu'mon GM you have to do better than that to stay slovent. Opps, too late.

So, what pressure(s) are you running and/or can you trace down the lack of electricty to your compressor's clutch? You've just started to trouble shoot this problem.

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I had a Live Chat with u, we were disconnected, your problem is most likely the AC expansion valve, this part is located in the low side AC line just before the evaporator core in the dash., u must evacuate the system to replace the part and then pull a vacuum (with AC vacuum pump) and recharge the system..

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