Where is the fuse for the ac fan on a 1988 Mercedes e300 and what else might be wrong when the fan wont turn on?

Fuses are under the hood on the drivers side inside a black plastic box. Release the catch and open the fuse box cover to reveal the fuses. Consolt your manual to give you fuse location for the A/C fuse. Also there is another black box just behind the first one that has relays in it.