My 1990 C4 A/c is not working . The blower fan works. When I press the A/c button, the button light comes on, but I cannot hear the system "engage" like it used to. Similarly the engine revs do not drop when I press the button, so I assume the compressor is not going.
I have checked the fuse to the a/c compressor and it it intact.
I have had a flat battery since the last start up, when I thought the A/c worked, and recharged with a trickle charger , if this is relevant. Any suggestions?
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Pelican Technical Article: Porsche Air Conditioning Frequently Asked Questions