The fan for the heater or A/C stopped working. Doesn't matter what speed setting or if it's heat, a/c, ec, nothing blows out. How do I start troubleshooting this to see if it's a fuse (checked already, all good), rotary fan switch, fan motor, fan regulator/resistor, etc... I could replace it all but these parts are not cheap. I've heard the most common problem is the regulator/resistor. The car has 91K miles and it's a 1998.

Spend some time searching the forum. This sounds like the kind of problem you'll find a lot of chatter about.

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2012 E350 Bluetech

OK, so I found lots of chatter and determined the brushes need replacing. I see that **************.com has brushes for older MBs. Does anyone sell brushes for the R170 SLKs?