Check fuses and relays
SOURCE: S320 Air Conditioning
I also had the same problem. a/c system on mercedez s class is very sensitive, you must discharge the old freon and use new freon as specify on the manual, and precise pressure : 14 bars. you may find the specification under the hood. if the pressure go under 13 bars, the compressor will automatically shut off, and the red light on the EC button will be on.
SOURCE: climate control unit passengers side
My Buick had the same problem and it was simply a stuck damper, behind the glove compartment. Freed it up, simple fix, works fine now.
SOURCE: blower fan
Sounds like the problem is more with the blower motor assembly itself. The blower motor have micro-proccers built itnto them which comunicate with the control heads and do the actual regulating of the fan motor. Dealers have computers with diagnostic software which allows them to monitor what is happening in the eletronic controls of the vehicle. Electronic diagnostics without the diagnostic software makes it very diffecult to pinpoint the actual item causing the problem.
SOURCE: problem with air blower...
BlowerMotor Relay is Located On Driver Side in Engine Compartment and is the LARGE Relay in center of box CLOSEST to you If you are Standing On the Driver side of Car This is A Culpret, Also the "BLOWER MOTOR RESISTOR" also can Cause What You describe.
I HAVE PICTERS AND Manual Info But need Email Address to send as FixYa Wont Exept this Type of Files
Blower Unit Components Replacement
Note these items when overhauling the blower unit:
The recirculation control motor, the power transistor ), the blower motor (C), and the dust and pollen filters (D) can be replaced without removing the blower unit.
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