Air Conditioner Fix with Photo

Old 09-03-2007, 06:37 PM
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Join Date: Sep 2005
Location: South Florida
Posts: 1,450
Default Air Conditioner Fix with Photo

I explained this problem once before but here's the complete scenario.
The clutch on the air compressor stopped working. Not good when it's 100F in South Florida!
Doing quick checks, all the fuses and relays that relate to the compressor clutch in the front and in the engine compartment are fine.
My first though was I must have a Freon leak and the pressure switch cut out the clutch. I had the system cleaned out and refilled.
No clutch. I replaced the pressure switch, no 12V to the clutch yet.
The Air Conditioning shop couldn't figure out the problem either, and they have worked on most of my other Porsches in the past.
They know their job but they know when something is beyond their capabilities.
I traced all the wiring and the only thing I could do is run a wire to the clutch from one of the rear relays.
I chose not to do that and just try to find the problem myself.
I have all the manuals and I'm a broadcast engineer/electronics tech for a few decades so I'm quite capable of making changes or correcting the problem.
I took out the front and rear fuse/relay boxes and started the tracing.
I noticed that the engine compartment relay that delivers the 12v to the clutch was using the same wire as the relay that controls the right fog light!
I checked the right fog light and sure enough it was DEAD!
The relay that controls the right (passenger) fog light is the problem!
It's the one that my finger is pointing too in the front fuse/relay compartment.
So now you know that if the front right fog light is out and the air is not working the little relay is the fault.
BTW I took the relay apart and re-soldered the connection to the tab and everything is working perfectly! ~Chris~

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