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MB Paul
MB Paul, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3567
Experience:  Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes
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My air conditioning is no longer cool, i heard some grinding

Customer Question

My air conditioning is no longer cool, i heard some grinding noises prior to it stop being cool. I tried a/c pro as i previously used effectively but gauge is not showing any pressure, in the red still, any idea what this is and necessary fix?
Submitted: 1 year ago.
Category: Mercedes
Expert:  Ron replied 1 year ago.

Hello Ed and thank you for your question,

With the AC system turned on can you see the compressor clutch engage and if so is the compressor turning?

Customer: replied 1 year ago.
The clutch is not engaging, a/c control lights up and blows warm air
Expert:  Ron replied 1 year ago.

If you look at the AC clutch dose it show signs of discoloring?

Customer: replied 1 year ago.
Doesn't to me
Expert:  Ron replied 1 year ago.

Im thinking the grinding noise you heard may have been caused by a failing compressor clutch. If you take your 12 volt test light and check for power at the compressor do you have battery voltage at the compressor with the AC on?