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A/C compressor won't operate; control unit solder problem? 900 1994

posted by  Volvo945 on  Mon May 29 07:28 CST 2006
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last visit: Sat Oct 12 15:05 CST 2013
[RELATED]

My 945T has the manual A/C unit. When I depress the button to turn on a/c, it will be many hot minutes and miles before the compressor kicks in. Once on, it cools pretty well.

During testing in my garage yesterday, with the motor running and the A/C button depressed, I had volts at the low-pressure switch connector, also at the high-pressure switch connector, and at the compressor, but I had no compressor operation.

A visit to the 940 FAQ leads me to believe this is not uncommon. A bad design of the circuit board inside the control unit is the cause, with a re-soldering of certain terminals usually a fix.

My question is: have I done enough testing to rule out other causes, leaving the solder issue the most probable cause?

thx

--
'94 945t; '95 854 base; '05 S80 2.5T






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