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  #1  
Old 02-20-2003, 11:30 PM
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Join Date: May 2001
Posts: 161
Heat/AC interior Blower motor Brushes

My 87' 300E AC-Heater Blower motor has completely stopped working. I wondered if anyone has repaired these blowers by replacing the brushes. I had fabricated electric motor brushes years ago by sanding down a larger pair to fit the slot size and shape of the interior blower on a BMW
At this point I don't yet know for sure that brushes are what is needed, but was hoping that someone else knew if brushes worn out in high mileage MB's (192K)

I looked in a few part sources including Fastlane , but did'nt see brushes listed---just high dollar motor assemblies, with and without fans.

any help appreciated.

DanielW
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  #2  
Old 02-21-2003, 10:24 AM
J.HIDALGO's Avatar
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Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
Do a search under George Murphy...

I bought a set (just in case) when I replaced my evaporator. I did not needed them. If he can not help you, let me know. I have them somewhere... I think!
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  #3  
Old 02-21-2003, 08:05 PM
fz500sel's Avatar
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Daniel,

Just got new brushes in the mail from George Murphy today.

They are for the blower in my W126 chassis. Once I received them and saw the new ones. I realized that my old ones weren't really that wore down.

The brushes were $19 a pair plus s/h

Good luck,
Frank
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  #4  
Old 03-09-2003, 12:11 AM
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Location: east of Atlanta, north of Macon Ga
Posts: 185
???

Daniel, Frank, did you happen to note any numbers on the brushes and where did you get them? Mine need replacing as well.
Thanks
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1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)
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  #5  
Old 03-09-2003, 05:36 PM
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I sanded down larger ones.

What I did was sand down ones which I purchased locally at a starter/alternator rebuilder shop ... I didn't ask what they fit. The worker just looked at the old one's shape an matched it with ones large enough that I could sandpaper them down to the exact size rectangle shape required.

The only difficulty making them was making the wire come off at exactly the right spot. I ground a little groove in the brushes top and Kwick J-B welded the wire into the groove and then it would come out at the right spot. From there , I soldered the leads onto the cut off old leads and oiled the motor bearing with laquer thinner mixed with moly wheel bearing CV joint grease.

The blower motor is running well. Also, I should tell you that I used a hobby grinder to shape the contact area, where brush touches the copper motor shaft, to "exactly" the same oval shape as the old worn brushes.

Motor has never been quieter and blows very well, even on the "off" position which revolves very slow at all times in order to keep cabin ventilation coming all the time. My draging bearing shaft had previously prevented the "idle motor-ventilation" function from even working.

TOTAL parts cost was $2.00 US dollars !! But I spent most of 2 days working on it. Oh well, I love to tinker with my MB anyway.

Luck to you, DanielW

PS If you decide to do your own write me back if you need step by step of what to remove to get the blower. It's buried under the wiper assembly ----- But you may know that if you know it needs brushes. DanielW
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  #6  
Old 03-09-2003, 09:05 PM
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Location: east of Atlanta, north of Macon Ga
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Thanks

Thanks Daniel, I took my blower out again today (mine is under the dash) and noticed that the motor is dragging too, squeeky bearing gonna get oiled too. I'll try my local NAPA, they seem to be able to come up with many of my "odd-ball" projects. I'll let ya know how it comes out. I even thought about hitting the juck yard where I once worked.
Bruce
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1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)
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  #7  
Old 03-16-2003, 01:21 AM
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Location: east of Atlanta, north of Macon Ga
Posts: 185
Can you say "fresh air"....

Got new brushes from ACE hardware, can't remember what they were supposed to fit, filed them down to size, soldered them in, and then the durned connector on the motor broke off while installing it. NO PROBLEM, American ingenuity (thanks to my Uncle Arthur) took over and soldered a set of pigtails to hook up to the wiring harness and once again have air blowing around (WOOOO HOOOOOO).

While I was at ACE I was looking for some oil for the motor and found "Zoom Spout Oiler". Bottle says turbine oil made for bearings, elecric motors, bushings, blower motors, and high temp environments. A couple of drops on each end and no more squeeks and it spins like a new one. I'm going to try some on my throttle linkages tomorrow.
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1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)
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  #8  
Old 03-16-2003, 02:13 AM
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Join Date: May 2001
Posts: 161
That's great cause summer is coming soon

It always pleases me if someone is able to use any of my DIY advise to do a job without $$ flying around. MB techs might say that the old blower motors won't last very long once the shafts get tight or brushes wear....... But $2 looks great compared to the multi hundreds that even Ind. Tech would do that job for not to mention the 700.00 estimate from MB dealer.

If your car uses the same accessory belt tensioner as my 300E you might want to search for my post on a different idea about repair of that tensioner. Different procedure than MB doc outlined, but worked for me and makes sense to me even tho I did not get positive feedback from any of the people who monitor this forum.

Luck to you,
DanielW
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  #9  
Old 03-16-2003, 03:18 AM
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Location: east of Atlanta, north of Macon Ga
Posts: 185
I have a serpentine that runs tight and true, so far. I don't want to type this too loud for fear that the Benz might hear.......
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1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)
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  #10  
Old 03-16-2003, 03:51 AM
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Join Date: Jan 2002
Location: NW Indiana LaPorte
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brush kit

there is a guy on ebay that sells a motor kit just for this purpose. has instructions and new brushes. i think he sells them for 20$. his old name was kbnorthwest he just changed his name a while back but if you go there you will find him.
good nite!
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