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AC circuit diagnosis (MY1995) Posted by Henry Helfman [Email] ![]() ![]() |
With humid NY/NJ summer fast approaching I'm going to revisit this issue I haven't tackled yet. I want air conditioning.
My A/C system has kept it's charge but the compressor is not kicking on. Clutch wire is not getting voltage. When jumped to +12V (at the relay terminal) it works, system gets to good pressure and works as normal. During the cycle the cooling fan kicks on too which would indicate to me that the system is able to sense when it reaches HIGH pressure.
When I presented this a few months ago I became discouraged because too many printed sources were indicating that the low pressure switch is in the wrong location as earlier 9000s (passenger side aquarium cover) My AC relay is underhood by battery and I believe that the low pressure switch is behind the passenger head light in a very difficult to reach location.
Conclusions I come up to is that it is either the relay itself (I doubt the metal framed bosch unit failed internally) or the low pressure switch. Is there anything else in series that could cause the relay to not energize? Is the low pressure switch the same unit as the high pressure switch?
Henry
1995 aero 5spd 191k
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