No signal to AC compressor. 1994 W124 - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 06-06-2008, 07:37 AM Thread Starter
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No signal to AC compressor. 1994 W124

Now that I have fixed my alternator I need to tackle the AC. The refrigerant was topped up some time ago and is still holding pressure, but there is no voltage to the compressor to engage the clutch. It worked fine for a while after the top-up. Any common ailments that might be the culprit?


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post #2 of 2 (permalink) Old 07-27-2010, 11:25 PM
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Check the A/C relay (behind the battery). I found some corrosion on the plug. When cleaned with light sandpaper, and replaced in the socket, the compressor came to life.
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