View Single Post
Old 10-06-2002, 12:14 AM
EricSilver's Avatar
EricSilver EricSilver is offline
Registered User
Join Date: Mar 2000
Location: Fairfax, VA
Posts: 1,248
Jeff, thanks for the link.

I was also able to locate that article through The text is intact but not the photos, and I have reproduced it below.

I probably will not tackle this right away, but will surely do so long before winter.

Thanks again.


Blowing hot air
by Alex Kowalski

After a recent long drive my HVAC blower motor seemed to pack it in. Some of the symptoms included intermittent fan action especially when I hit a bump in the road. Ultimately it just stopped working altogether and would not restart no matter how many speed bumps I straddled.

After a five minute consult with the Mercedes Mailing List archives it appeared clear that part of my problem may involve the blower motor brushes which naturally wear with use. A new blower motor is around $250 from discount sources. George Murphy's Performance Analysis ( tel # 423-482-9175)sells the appropriate soft lead brushes for $15.

I thought I found the cheapest source of Mercedes' blower motors known to man when I can across the website who claimed to carry them for under $40.

In the above photo you see the new motor from wrenchead sans squirrel cage on top and the old motor with removed squirrel cages on the bottom. Interestingly enough the new motor was made by Seimens in Mexico and packaged by AC/DELCO. Even though they looked very similar the new motor was slightly differently shaped. After many unsuccessful manipulations I realized it would have required too much modification of the plastic holding casing to work properly. Lesson learned, sometimes aftermarket parts really suck!

Since I already had the motor out and need the car for work on Monday I decided I would go to plan B and take a look a inside. But before I leap too much ahead lets have a quick pictorial tour of how to take the blower motor out.

First step involves removal of the single arm wiper assembly. Make it easier on yourself get you wiper to point directly up

Pry open the cover just above the swing arm base, you will find a single bolt (I think it's 10 mm), remove and pull the wiper arm straight up.

There are four bolts that retain the entire wiper assembly, two on the left as in the above picture and two on the opposite side.

Unplug the wiper motor electrical connector and remove the entire assembly

Now that the wiper is out you can attack the extensive amount of engine cowling/baffles. You will note that there are quite a few small screws and bolts retaining the plastic cowling.

I'm not going to show you all of them as they are easy to locate by yourself.

In any case after you remove all that plastic and rubber trim you will have access to the blower motor cover as in the above photo. the cover is held in place by several small spring clips ( six I believe). Once you have the cover off the motor is held in place by a single large spring clip and its electrical connector

This is a shot with the motor out.

As I mentioned previously I ended up taking the old motor apart and find one of the two brushes unevenly worn. Although both still had a fair amount of material left. I filed the one brush with an emery board. These brushes are very soft so you don't have to file much. After reassembly the motor bench tested perfectly. Unfortunately it was getting late and I did not get any good pictures of the motor innards. The removal of the motor took 1.5 to 2 hours plus approximately 1.5 hours to repairing the old motor back to life. All in all, well worth the effort as I figure I saved a $400 to $800 trip to the dealer (depending on your local shop rates
2001 E430 4matic
122,xxx miles
Black/Charcoal Interior

Gone but not Forgotten:
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
Reply With Quote