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chandrab 04-30-2000 06:37 PM

When the A/C is turned on my 1994 C220 the A/C fans don't come on at all. I first thought the engine wasn't hot enough so I let it run for a while and the engine got very warm under load and A/C..but still no fans (and no overheating/boil over thank god).

First think to check is the fuses and relay. Except I can't find them! A previous post said "There is a relay that is located under the top side of the fuse box. "...Can someone give me a more specific location in which to look?

Any other ideas/tests? I remember on My 190E you could get the fans to run by connecting two leads near the A/C evaporator (pressure switch?). Is there something similar in the C220?

Many Thanks,

metricman 04-30-2000 07:29 PM

The lid of the fuse box that lifts up is on top of the cover for the entire fusebox assembly. I believe there are 6 screws total. When I test the AC I put it on the coldest temperature (min), put the blower on max, push the recirculating air button and let it run. If the AC has a full charge, the compressor and the auxiliary fan will cycle on and off. I often find the fuse in the relay blown, it is GM style 10 or 15 amp.


chandrab 05-02-2000 08:56 PM

Thanks for the tip...I did have a burnt out fuse and I replaced it with a 20 amp fuse. I still can't get the A/C fans to operate. Under what conditions is the fan supposed to turn on?

Any ideas on what to check next?


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