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Old 03-28-2009, 08:21 PM
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Join Date: Apr 2008
Posts: 104

Since this is an AC question, I posted it here. I hope this is OK. The AC in my 300 SDL used to be intermittantly cold, now it just blows, but no cooling. Heater works well. I'm pretty sure it's the controller behind the switches. I got this video that showed that fixing the controller was just a matter of resoldering all the connections. The guy claimed that the relays never go bad. Could this possibly be right?

Bruce S
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Old 03-28-2009, 10:15 PM
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Join Date: Feb 2008
Location: Downey, SoCal
Posts: 1,174
Take it to a professional and have the system leak tested... If it has the proper refrigerant level, and the compressor is working, then you should start looking into the controls.
Current cars:
2000 ML55 AMG, 151k miles
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Old 03-29-2009, 12:30 PM
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Join Date: Apr 2008
Posts: 104

I should have put that in. The compressor is fine and the refrigerant level is also good.

Bruce s
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