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  #1  
Old 01-13-2005, 12:18 AM
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Heater fan motor

I have done a fair amount of archive searching, but have not found what I'm looking for. The current fan motor in the '83 300D seems to be working most of the time, but somewhat noisily. Figured that I would take the one from the '85 parts car, clean and check it out and repair if necessary. Then swap them out. There is a lot of black dust on the fan which looks like brush remains. However the parts car fan motor appears to be one of the Siemens type where the brushes are at the end where the fan covers everything. Also there does not seem to be any thru bolts holding the motor together, just crimped spots on the peripheral area of the junction with the (bottom?) cover. Does anyone know if the Siemens motor, if that is what this is, would also be in the '83, or was there a certain year range for these vs the Bosch which seems to be the other brand?

I really don't want to take the one out of the '83, which we are currently driving, and not have a fresh replacement ready to put back as cold as it is right now. How difficult is it to remove and replace the fan from the motor shaft without damage?

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  #2  
Old 01-13-2005, 12:55 AM
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Answer:

1983 Mercedes Benz 300SD
Part: Heater Motor
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1F01D5QWG1FC01UUP3&year=1983&make=MB&model=300-SD-002&category=R&part=Heater+Motor

1985 Mercedes Benz 300SD
Part: Heater Motor

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1F01D5QWG1FC01V2NJ&year=1985&make=MB&model=300-SD-002&category=R&part=Heater+Motor

Part is the same for both.
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  #3  
Old 01-13-2005, 02:15 AM
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The fan comes off pretty easily. I used a vise, a drift and a BF hammer. Open the jaws of the vise wide enough to support the closed side of the cage while the motor hangs down. In that position you can use the drift to drive the shaft out of the fan hub.

That said, I doubt that the Siemens motor will require any service. You could probably use some electrical parts cleaner to flush out the goo and let it go at that.

If you do choose to remove the fan, you'll discover that the area the Siemens brushes sweep on the motor's commutator is three or four times the area the brushes on the Bosch motor cover. So wear to both the brushes and commutator on the Siemens motor is drastically reduced over the Bosch. It's simply a much better motor.

Funny thing -- I found my '82 300td had the Bosch motor, my '82 300cd had the Siemens. I'm not sure there was any rhyme or reason which car got what.

HTH
Russ M
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Old 01-13-2005, 07:53 AM
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Location: CT, USA
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FWIW, I was at a parts yard over the holidays that specializes in German cars (mostly BMWs, but an impressive number of 123s), and the owner told me that there are a bewildering number of arrangements of blower motors on 123s. He jokingly told me that it appears as if each car has a different setup.

Personally I'd just pull the motor in your existing car and compare the two side by side to see if you can swap them.
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Old 01-13-2005, 11:51 PM
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Thanks for all of the ideas on this one. Just as an FYI, the motors in the pics are not like the one from the '85 parts car. The cylindrical part of the motor showing outside the fan area is completely closed all the way to the bearing plate, which is also totally closed. There is not even visual access at that end. From what Douglas and Maki have said, there may have been no order to which one of the motors that was applied during the assembly of our cars. I will attempt to clean up the one from the parts car, and hope the one in the '83 holds on till the weather gets better. Too cold to swap or even look at it right now.
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1968 220D/8 325,000
1983 300D 164,150
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  #6  
Old 01-14-2005, 03:23 AM
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Good luck! I resurrected a Bosch/Behr motor in my 300td last year with some 12-volt DC brushes I ordered from a local factory. They wouldn't deal for less than $100, so I bought two dozen and sold off the spares. I also inspected the blower motor in my coupe -- the Siemens motor showed some very minor commutator wear but the brushes looked like they could go another 20 years. If I were looking for a fresh blower motor I'd search the junkyards for a used Siemens motor before I'd buy a new Bosch. They appeared to be interchangeable, although I never actually attempted the swap. If they don't interchange, please let us know.

Russ M

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