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?

thanks
Bruce S

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.

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles

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

thanks
Bruce s