A/C recently ceased working. When it is cool out it works fine, when the temp is above 75 degrees or vehicle is driven for more than 15 min the A/C cuts out. Troubleshot the compressor and determined it was going bad and causing excessive drag on the engine as well as making a chirping sound. Replaced the Compressor, Condenser and expansion valve and all seals involved; ensured to add appropriate oil to the condenser and performed oil balancing on compressor prior to install and flushed the lines and evaporator; drew 30lbs vacuum, checked for leaks and charged the system. Problem still persists. If I ground the clutch relay control thereby bypassing the ECM the A/C clutch engages and system works. Static pressure is roughly 110lbs, when clutch is engaged low is around 60 high is around 240. Pressures are good and the system can cool if the ECM would let it. Fairly certain the pressure switch is serviceable as the 5v reference is present and the signal voltage is within tolerances. help
My car has 180000 miles.
My car has an automatic transmission.
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