The relay of C180 is locate at the front near the brake servo in cover with black top.
it is usally a dry connection on the fan speed switch
Take it to a mercedes garage
The fan belt is fit onto a Mercedes Vito by loosening the alternator bracket and allowing it to move downward. The belt can then be slipped over the remaining pulleys and then back over the alternator.
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How much it is going to cost
On my Mercedes sprinter the cause of the fan belt vibration at low idle speed was the pully on the alternator.This pully should ratchet in one direction.
You can find a diagram for fitting a fan belt on a Mercedes 308D Sprinter in the owner's manual. You can also find it at select auto part stores.
Start by taking old one off first, noting direction, and what pulleys it goes round first, then slacken the tensioner. Then re-fitting is reversal of removal.
Have you checked your owners manual? Surprisingly this was listed in mine but I have an older model.
Hi Just above the Alternator is a long threaded bar with a nut on the end. this is the tension adjuster. slacken the nut off until the belt is loose enough to take off. replace the belt, tighten the nut back up until the belt gets to the same tension and you are away to go :D Hope this helps