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I had a mechanic replace my exhaust headers a while ago on a 2.2 L 4-Cyl. Engine and he had to remove the A/C unit to get to it. Now when I tried to use my A/C system it is not cooling down as it did before and when I tried to add more oil/frion mix into the system, the gauge was telling me that there is well over 100 psi of pressure inside and that I obviously shouldn't add any more. During the process I had the system on Max A/C and the fan on high. In the middle vent there were small bits of sponge being blown through it. Through my random search of answers I think it might be the sensor that controls the compressor and tells it when to turn on/off. Any suggestions or ideas would help....
 
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It may be the sensor or it may be the compressor itself, check to see if the clutch on the compressor is engaging when you turn the AC on, if not the compressor may be bad.
 
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