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AC low pressure switch cycles too quick 700 1988

posted by  someone claiming to be Volvouser on  Thu May 3 05:10 CST 2012 [RELATED]

Dear Brickboarders,

I have a question regarding the AC low pressure switch. A time ago, I had to replace it because the old one leaked. This was done at a well-reputated AC repair garage.

However, since then it cycles crazily several times per second just as described in the 700/900 FAQ (see below) and I guess that I have a faulty switch too. I asked the garage but the guy just said that I could try tweaking the adjustment screw. Since the poster (Chris H) wrote that he had TWO faulty ones is there any reason to go back to the garage since they probably just would replace it with another faulty one? What would you do in my situation?




http://www.brickboard.com/FAQ/700-900/HeatingAirConditioning.htm

[Response: Chris Hollis] I had the same problem with my '94 945T. You might check continuity of your low pressure switch: I had a bad low pressure switch. I bought TWO bad switches from Volvo, before I bought a third aftermarket switch from a place called The Volvo Site, part number 1343216. I forget the exact pressure ratings, but they switch off (open) around 20psi and back on (close) around 40 psi. The bad ones I got would switch open at around 20 psi then almost immediately close again. This caused the compressor to cycle faster that you could count. Trying to figure it out drove me nuts.






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