On my 1986 560SEC, the #5 fuse would blow whenever I turned on the A/C (which blew plenty of cold air). Now, the A/C clutch does not engage at all. The high pressure switch turns on the fan, but there is no power to the low pressure switch. I researched similar problems in the archives, but didn't find these exact symptoms. I have the following questions:

1. Could the relay that operates the compressor have gone bad?

2. Where is it located (there are several identical relays in the fuse box)?

3. I'm going to run 12v directly to the A/C clutch terminal to see if it "clicks". Are there any other tests I should run?

Thanks in advance for the help.

Max J. Sandler

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M. Sandler

1986 560SEC: 150,000 miles, runs great, but I've got to sell it (too many cars for one man)
1987 560SL: 122,000 miles, used to run poorly, now (thanks to forum), runs great!
1997 GMC Jimmy: Turned out to be a turkey.
1989 T-Bird Super Coupe: 150,000 miles, still runs great. Ford got it right.