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1982 Mercedes-Benz 500 Series 500SEC Coupe Base

1982 Mercedes-Benz 500 Series 500SEC Coupe
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March 14, 2009, 6:15 am

Gary M

Question: cannot get A/C to work, blower motor switch does not

cannot get A/C to work, blower motor switch does not operate on any fan speed setting. Blower will run when 12V(external source) is applied at motor. Shorting out press. switch at drier does not activate compressor clutch.???

March 20, 2009, 9:59 pm

Elizabeth K

There is a relay in the blower motor circuit.

Even at low pressure the compresser will kick on and try to build pressure. Do you hear the clutch engage?

If an a/c system has been not working for a long time, it is rarely worth the money to fix it (unless you live somewhere very hot, where you have no choice). And even then it may not be worth it.

Here is a link to a Mercedes forum on the website. I did not see a dedicated forum for the 500 series, and am sending you to the 300 series forum, since I think the a/c system is the same.

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