Question about 1990 Mercedes-Benz 300 Diesel

2 Answers

Hello, My name is Ken. I am knew to this site or any other help sites for that matter, and I'm hoping that one of your experts can help guide me to fixing my car's problem. My car is an '87 300 SDL turbo. The issue that I'm having is related to the climate control system. None of the controls to the fan or temperature controls seem to be functioning. The only thing that happens is I have HOT air coming out of the defroster at all times. I have disconnected the ccs unit completely, nothing changed. I even went as far as to replace the unit with a supposed good working ccs unit, no changes. Can anyone help? Thanks, Ken.

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  • lakelan Oct 02, 2010

    Hello, can you give an idea where to start looking for the valve, and specifically what is the valve called.
    Also, as far as the fan not working, if I were to start back-tracking from the power connection at the back of the climate control unit, where would be the next connection be. I do not have a schematic.

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2 Answers

You will need to replace the blend door acuator, the little motor gear that turns the vent door is broken or stuck and that is why you have heat only coming out of the defroster

Posted on Oct 03, 2010

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  • Mercedes-Benz Master
  • 11,800 Answers

The heat in your car is generated by a heater; that heater runs with the coolant from the engine; to control the temperature on the pipe coming from the engine to the heater there's a valve.
In your case that valve is stuck open, probably because it was seized by deposits. All you have to do is to replace that valve. The same valve is used in all W126 models so you can find a replacement one very cheaply at a breakers yard.
The fan problem is electric so you must check all the connections, starting at the fan motor

Posted on Oct 02, 2010

  • Azrael SRL Oct 03, 2010

    It's called a heater valve and it's bolted right on the heater, at its intake.



    The next stop is the resistor pack from the motor of the fan , located right next to it.

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