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??