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AC Compressor Circuit Troubleshooting 900 1993

posted by  LandonT on  Tue Aug 30 19:14 CST 2005
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Hi, please confirm that basic checks have been done and the next step...(93 940NA Wagon, 155K)

AC compressor does not click on or engage. The on/off button does nothing(AFAICT). Found voltage going to the compressor - 12V with engine running. Found good ground at the back of the compressor at the ground wire terminal. Checked the resistance from the power wire through the compressor to ground, at 3.4 ohms, this agrees with the faq for good. An AC shop verified today the system is properly pressurized and no leaks. (was just evacuated and refilled 3 months ago) Drove it around, no change.
Shorted the pressure switch at the accumulator, no change. Found voltage at that switch jumping around at idle, from 5V to 10.5V between the hot terminal and ground. It was inconsistent.
What's the next step, is it time to check the solder joints on the dash control board? Thanks for your thoughts.






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