Having problems with your 1990 Mercedes-Benz 300 Diesel ?

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 ch

Posted / edited by AnonymousUser on : 19-02-2018

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
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.\012\012\012
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
Repair Help & Product Troubleshooting for 1990 Mercedes-Benz 300 Diesel

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