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Re: A/C clutch won't engage (archive)

[ Follow Ups ] [ 7-series (E32) Message Board ] [ Msg. Board FAQ ]

Posted by Robert on August 10, 2001 at 06:49:01:

In Reply to: Re: A/C clutch won't engage posted by Beam me up on August 09, 2001 at 12:20:09:

The problem was the low pressure switch after all. I bypassed it temporarily by pulling the wires off of the switch terminals and connecting together until I can get the the bimmer parts house. Thanks for the help.

This is simple. To verify that the clutch is Ok hot wire it. After this test is OK, bypass the low pressure swith by joining the two terminals with a conductor. If this activates the clutch, the problem is there. Check if your system is at least 70 PSI. So, on the other hand the checking resulted negative, check the voltage on the terminals of that connector with the AC button "on". One of these terminal need to have 12V. If not, you need to go to the fuse box or the switch and continue checking. Let me know how you do.
(Make sure that you are testing the low pressure switch and not the high pressure).

Good luck!

I just converted my A/C over from R12 to R134A. I recharged with one can of R134A to about 70lbs system pressure. However, the compressor clutch won't engage. I can force it be engage manually by hot wiring with 12V. I've though about the low pressure switch but it was working fine before conversion. Any help would be appreciated.

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