A/C compressor will not engage


Asked by Aug 10, 2014 at 04:17 PM about the 1992 Oldsmobile Ninety-Eight 4 Dr Regency Elite Sedan

Question type: Maintenance & Repair

A/C system had a freon leak. Replaced accumulator nd o-rings added 3 ozs. of PAG oil.  pulled vacume for 90 minutes.  Added on can of R-134A, startted engine turn on climated control and compressor did not engage.  Checked low pressurre switch (jumped terminals) and compressor did not engaage.  Any ideas?

4 Answers


Loss of compressor voltage, compressor clutch coil circuit open.

2 out of 2 people think this is helpful.

Bad compressor relay? HTH. -Jim


Gents, thanks for your relies. I think first I need to determine if there is 12 volts going to the compressor. There are two sensors on the back of this compressor (High pressure and ???). I need to rule these our as causing the no start condition. If there is power and the sensors are good, I will run a jumper to the clutch to determine if this items has failed, if good then I'll move to the electronics. Is this a good path or have you seen this condition. Thanks for you help. Doug.

1 out of 1 people think this is helpful.

Sounds like a good plan of attack, Doug. The other switch on the back of the compressor is most likely the low pressure cut out. HTH. -Jim

1 out of 1 people think this is helpful.

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