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Replace the climate control/fan circuit fuse.
Mercedes-Benz 2002 C240 fuse placement fuse box schematics
The fuse for the wipers in a 2002 Mercedes c240 is located on the fuse panel, that is located on the driver's side engine compartment. The fuse number for the wipers is 46.
c280 fuse diagram
If you look on the backside of the climate control unit in the dash you will find a glass buss style fuse. It will be blown. Replace the fuse and your fan will stay on with your headlights.
Fuse box in engine compartment, fuse # 43, 15 amps.
Where the fuse box located
Where do I find the fuse for the cigarette lighter in a c 240 mercedes?
no there is not
In the truck drivers side the first fuse 30amp ( color green)
check for a blown fuse in the trunk, driver's side, fuse box.
The fuse box is located under glove compartment. However, if there is desire to access the bulb and fuse on the climate controller, twist and remove the knob and it should be connected at the back.