QuestionQUESTION: I have a 2003 mercedes clk 320 the engine fan light came on so i checked the fan motor and i felt it needed to be replaced so after i replaced it i still had the same problem so now i have turned my attention to the fan control unit but before i buy one of these is there anything else in the fan system that could be causing this problem if so what? Also i am having trouble locating the control unit do you know where it is located? Thank you for any help possible.
ANSWER: Arthur,
By Aux fan are your speaking of the fan at the radiator under the hood or the fan in the climate control?
Robert
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QUESTION: The fan at the radiator
ANSWER: If it is on continuously, the computer may not have recognized that it has been changed out. Try resetting the computer. Turn off all accessories, and radio, unlatch the hood, lock the doors with the key.
Raise the hood and disconnect the battery - then the +. Clean the post and the terminal ends, and add lubricant or the felt anti-corrosion rings. Wait 30 minutes and install the + and then the negative terminals securely.
Close the hood, unlock the door with the key and start the engine. See if this makes the fan lite go out.
Good Luck
Rob
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QUESTION: The fan doesnt come on at all and is new i will try as you suggested but i have a feeling there is another problem
AnswerI misunderstood your questions. I thought you indicated that the fan is working, but the instrument light will not go out.
The fan only comes on when the engine water temp switch calls for fan. Or in come cases, when you have the AC turned on, it will operate full time to help remove heat from the condenser.If this is a new fan, then I would take a look at the thermal switch at the water inlet on the block. It may be defective. I think it is a normally open switch. You should be able to ground the wire and check to see if the fan is coming on.
Good Luck
Rob
