Aircon no light - no compressor power on - climate control PLEASE help - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 07-02-2008, 11:43 PM
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Aircon no light - no compressor power on - climate control PLEASE help

Ok Gents so i have a 92 e34 m50 with AC issues - it's Simple: I haven't run the AC all season of course but now that i try to turn it on, Nothing, no light on the button and no noise change from the engine (ac compressor unit kicking in) and yes i have tried all fan blower speeds (which all seem to work) and tried re-seating the compressor wire connections. The fuse panel has all of the related fuses intact and my only guess is the "sword"????
It's really hot and i have a friend i need pick up from the airport next week - please help!!!
-Bro
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#2 (permalink) Old 07-03-2008, 12:11 AM
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Lightbulb

first line of suspicion is that since your switch doesn't light, the A/C switch might've gone bad.

2nd line of suspicion if frst one checks out fine... your system has run low on freon.

Automotive systems are designed with a pressure cut-off switch that disables the A/C system when there is little or no freon in your system(to save the compressor from burning out).

Easiest way to do this is to look for a shop that can recharge your freon(and since u have a '92... i hope it has been retrofitted to accomodate R134a, otherwise, you'll need do a conversion fr R12 to R134a)

If the A/C manifold readings show some pressure(at least 25psi on the low side port), next area to look at would be your A/C relay.
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