Wiring diagram HVAC (Air Conditioning) - The Unofficial BMW M5 Messageboard (m5board.com)

gwm635 · 15th December 2007, 10:22

Hi gang,
I'm in search of a wiring diagram for the AC system on my 3.6 RHD M5. Apparently M5's are different to standard E34's

I have a problem with my AC where the switch/relay (whatever!) that turns off the compressor on full throttle is permanently engaged meaning I have no AC. For now we have by passed it with an attractive green wire running across the engine bay, but what I really need is the wiring diagram so we can find the fault and fix it.

Anyone know where I can get one?

GoneAgain · 15th December 2007, 14:02

Try this site mate.

http://www.e38.org/e34/

specifically here

http://www.e38.org/e34/e34_90_etm.pdf

Lots of good stuff. I believe I have finally tracked down the exact wires/connectors/plugs into the dash to get my oil temp gauge working. Pity I popped the donk first!

Alan Archer · 15th December 2007, 19:04

Give your low/high pressure switches a test...
it could well be the system is telling the truth & cutting out
with good reason..

Regards,

Alan A.

gwm635 · 15th December 2007, 22:40

[quote=Alan Archer;1206164]Give your low/high pressure switches a test...
it could well be the system is telling the truth & cutting out
with good reason../quote]

Thanks Alan,
But if it was a pressure problem the bypass wouldn't work. We know why it is not working, we just need a way to trace what is causing it.

Alan Archer · 16th December 2007, 10:51

Cool, ok...didnt want you trashing the compressor !

Good luck with the search.

Regards,

Alan.