Diesel RVs: Re: [diesel_mercedes] Re: Uro Parts Blower Motor & Combo Switch for W123

Brushes, per se, don't cause or relate to the current draw of a motor.

The brushes should be replaced, if they are worn out.

But the current draw of a motor is directly related to the load on the motor. For these motors, the accumulation of schmutz in the bearing may be a cause of load, and thus current draw. A good cleaning of the entire structure, and a good lube of the motor bearings might be the most effective step in restoring motor efficiency.

(Of course, it is possible, even probable, that a modern motor design will be more efficient than the 30 year old designs of our 123 and 126 heater blowers.)

Tom

In a message dated 4/12/2013 1:07:26 P.M. Pacific Daylight Time, jim@tazwade.com writes:

Thanks for the review, bobthevan, sounds promising, I definitely need to draw less amps, does it blow about the same amount of air as the original?

Jim

--- In diesel_mercedes@yahoogroups.com, "bobthevan" <conrad.jacoby@...> wrote:
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> > Anyone tried the Uro Parts Blower Motor for the W123? Remember for a while those motors became impossible to get and suddenly went over $500 new? Now I see they are back as Uro Parts new around $90 at the usual places, autohausaz.com, rmeuropean.com, ebay.com, etc. I just ordered one for my 84 300D...hope they draw less amperage than the original. Will let you know how it works out if anyone is interested.
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> This past Fall, I installed a Uro blower motor when the brushes finally wore out in my 300D and I was pressed for time and needed to get the heat up and running in a hurry. At the time, Autohausaz had some kind of sale going, and I got mine for $74.00, I think.
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> Installation was dead simple, though I noticed that the plastic housing for the Uro fan was thinner and lighter than the genuine Benz article. Also, I found that the new motor had a faint but clearly audible whine that the old motor never had. It's kind of annoying until I get up to speed and other noises drown it out. :-)
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> The new motor does draw less amperage than the old one. I may still do a proper brush replacement and reinstall the old one, though, simply to get rid of the whine. I expect my ancient Honda to make noises like that, but not my diesel.
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