About 8 months ago, I replaced the motor brushes on the climate control fan on my 82 300D, and it has worked like a champ until about 2 weeks ago. Then it kind of slows to an intermittent crawl. After an overnight, the fan will start up with the car, and then after 5 or 10 min's. crawl, then stop.

Is the likely problem that I would need a new motor, or is there a relay somewhere I can check?

Thank you!

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1982 300D, anthracite grey, 260k miles, Greasecar
1999 E300D, black, 160k miles, Greasecar
2010 Honda Insight Hybrid
http://www.chuckwyatt.com
http://www.wordimpressive.com

Yes, there is a 5 blade, double-contact relay that controls the blower. I have seen them overheat from poor contact/corrosion and cause a similar problem.

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

Thank you, Doktor Bert! I'm looking in my Haynes manual, and not sure where that is located. In the engine bay, I hope... or is it buried in the dash somewhere?

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1982 300D, anthracite grey, 260k miles, Greasecar
1999 E300D, black, 160k miles, Greasecar
2010 Honda Insight Hybrid
http://www.chuckwyatt.com
http://www.wordimpressive.com

My Dad has a 1982 300SD (126) and it is behind the glovebox....You will save time by checking the manual....

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

When you replaced the brushes, did you install new springs too????

__________________
Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

Blower Motor Links Page
Blower Motor Links Page




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__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

The relay is incorporated in the CCU. As stated, you should check the amperage draw of the blower or look for shorts in the wiring.



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1983 123.133 California
- GreaseCar Veg System

Hmmmm.....I am quite sure Dad's 1982 300SD has an external relay.....

__________________
Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

Sure, sure did. It's cold out there, so haven't had a chance to check on the current draw. I did remove the glove box and I do hear a relay clicking behind there. Here's the thing... on closer inspection what I'm finding is that fan motor is getting very sluggish. I can feel the arm of it spinning with a finger and bang on the housing which seems to coax it back to speed.... for a while. So it is either some issue with my spring/brush install of several months ago, or perhaps the motor is wearing out some other part.

__________________
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1982 300D, anthracite grey, 260k miles, Greasecar
1999 E300D, black, 160k miles, Greasecar
2010 Honda Insight Hybrid
http://www.chuckwyatt.com
http://www.wordimpressive.com

BTW...This is an awesome list, and where I got the source for my blower motor brushes...brand new, re-engineered, WITH springs!

__________________
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1982 300D, anthracite grey, 260k miles, Greasecar
1999 E300D, black, 160k miles, Greasecar
2010 Honda Insight Hybrid
http://www.chuckwyatt.com
http://www.wordimpressive.com