My S420 AC sometimes on very hot days, ( F 100+), will cool fine and then after sitting in a parking lot perhaps 30 minutes will not resume cooling. Upon re-starting the fan will blow like normal but it creates NO cooling of the air. It's as if I had pressed the EC button !

Do you have a possible explanation for what might be causing this. Later the cooling comes back normally.

Is there some device or switch which will disable the compressor under very hot underhood, or in cabin air temps?

I want to have a good idea about what exactly is going wrong before I call the MB dealer, (who for a few more months should honor the "Starmark" Warranty).

DanielW

Check the wires leading down to the compressor plug. A lot of times the plug or wires will get broken and not have a constant connection. Also check to make sure your belt is tight. If the belt slips and the compressor does not relay the same RPM signal as the computer is reading off of the engine, the climate control will cut the compressor off. Then you will often have to cycle the key to get the A/C to resume. Good Luck. Oh the broken wire is usually at the harness down at the compressor plug holding on by a strand so you will have to open the black housing to see if it is indeed broken or not.

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