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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 07-02-2008, 11:43 PM   #1 (permalink)
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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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Old 07-03-2008, 12:11 AM   #2 (permalink)
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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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