Radiator Cooling Fan runs constantly soon as engine started and goes to idle.


Asked by Aug 03, 2014 at 01:56 PM about the 2002 Mercedes-Benz SLK-Class SLK320

Question type: Maintenance & Repair

Checked the Temperature Sending Unit by unpluging the TSU and no change! Also, removed TSU and checked visually which told me nothing. If the TSU was open, would I be seeing the same problem??

4 Answers


Is your ac on? If so they should be running all the time at idle.

1 out of 1 people think this is helpful.
Best Answer

No AC is OFF!


Check your fan relay. Sounds like the contacts might be stuck.


Don't think it has a relay! Direct input to Cooling Fan is from a Control Module.

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