Harvest

Hello need help my.ac/ heat is NOT blowing no SERVICE light is on anyone?,

shobbs666

Water may have dripped on top of your blower motor shorting it out. It has been mentioned on this thread a lot about the cabin filter housing drain clogging cause water to enter the cabin right above the blower motor. MB wants $344.00 for a new one. eBay has then for $130-$180

Harvest

Thanks so much took it to a certifed Mercedes-Benz dealer it is the motor. $680 to repair. If i brought one from dealer dont have anyone to put it on. Where could've water come from?

shobbs666

The air filter exterior box is under the hood, right in front of where the front passanger's positioning is. if you open the hood, it's covered and nudged up near the front windshield. just pop open the 2 clips, and remove the cover...then remove the plastic grill(easy). Once you remove the plastic grill, you can use your flash light to see, but the box is about 8-10 inches deep and has a small rubbery drain area. use something to clear it out (mine was filled w/ water to the rim, so I reached in and used my fingers and wiped away some fine dust/mud).

Keep in mind, this is different than the interior cabin charcoal filter, which I think is under the glove box. this is connected to the exterior air box - which is why when the drain plug is clogged, all the water automatically comes into the cabin. to me, it's a pretty obviously design flaw.

bottom line, this simple drain plug (that didn't drain) is common for MB techs in TSB, especially for damaging the blower motor.