got a 2000 clk 320 and the cooling fan doesn't run, even when the engine overheated till the coolant boiled and steamed (that's actually how i realized the fan never worked since i bought the car couple months ago). the clk's onboard computer doesn't indicate any malfunction, all fuses are checked and good, nothing showed up even on a diagnostic computer in the auto shop. the shop owner told me i need to replace the thermostat but i don't think that's the source of the problem.

i've heard there's actually a fuse on a relay that controlls the fan on some mercedes models but haven't check this yet on my clk.

any other suggestions from any of you guys here??

Does the V6 that year still have the mechanical cooling fan and 2 electric fans? If so, then the electric fans are controlled by the Motronic control unit and the mechanical fan is controlled by the fan clutch. If the electric fans are not running, I would check to see if they are getting power at the appropriate time, if not then the motor may be suspect.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record

thanks ali... only one electric fan on my car. fan motor tested and works, just that there's no power supplied to the fan when the engine gets hot.

thermostat seems working too, because both the tubes on top and bottom of the radiator get hot after a while.

Either your version coding is incorrect or your pulse module has failed, or both.

thanks dux... please explain "version coding" and "pulse module" and maybe where they're located on the car?

has anyone ever heard of (radiator fan or any) relay failure on mercedes? i know many japanese cars have common failure problems with their main relays and certain components won't work because of that.