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So the mechanical side is not why the AC does... (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by WillO on April 02, 1999 at 08:36:56:

In Reply to: Re: So, are you saying that with a jumpwire... posted by TBM on April 02, 1999 at 00:54:39:

...not run. If you know how to work a Volt-OHM Meter then you could start checking to see where the problem is. Find the low pressure cutout/evaporator temperature switch and check resistance with the car off and the connector removed. The resistance reading should be almost zero. This means that the switch will pass current if a voltage is present. Is a voltage present? Not with the key off. Start car and turn on AC. Check the connector for voltage to ground. ......Check each device in the circuit till the problem is found.


: : ... the AC works OK? If so then you may only need a new switch. It is tough to second guess a pro who has looked at the problem, but the "tired" part came right out of SALES 101. Condensers generally last forever unless abused. Why not ask another shop?

: : Will

: I will take it to another shop and have them check it. I was looking at the wiring diagram in the Bentley Manual and it looks like there could be many possibilities for the electrical failure. I agree about the system being "tired" as a sales hook. When the compressor was jumped the air in the car got cold pretty quick. Any other advice would be appreciated. Thanks for the response!


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