Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

LinkBack Thread Tools Display Modes
Old 12-02-2010, 11:52 PM
JCSC2's Avatar
Registered User
Join Date: Jul 2006
Location: Nashville, TN
Posts: 201
Blower motor quit suddenly, clues?

Driving home one day and all of a sudden the blower motor quit. It was on high when it quit. It will not even work on defrost. I can feel heat(barely) coming out of vents. When I spin the temp wheel I can it here it clicking. I have checked the fuse for the blower motor. I read there is a strip fuse to check? Where is it? I read a thread where the poster was told to apply 12 volts to the blower motor. But not sure how to do that. Basically I want to check all the easy stuff before digging under the dash for the blower. Any help would be greatly appreciated. Thank-you! It's gettin cold out there!
1985 Mercedes Benz 300SD 212,000 miles
1994 Saturn SC2 130,000 miles
2000 Mazda 626 LX V6 (wife's car)
Reply With Quote
Old 12-04-2010, 01:31 AM
Registered Hack
Join Date: Mar 2008
Posts: 4,612
Replace the fuse on principle unless you want to get digging right away.

Next, I would use an ammeter to determine the change in current across the fuse when the blower switch is changed.

Then I would start digging and apply the voltage directly to the blower (how?... you need a battery with some leads on it).

last, I would pull the blower and check the contacts, they should be replaceable. Search for write-ups done by other members.
Reply With Quote
Old 12-04-2010, 05:08 AM
Registered User
Join Date: Feb 2008
Location: toledo, ohio
Posts: 29
I have an 87 300sdl and when i first bought it the blower motor quit working. I had to pull the motor and squirrel cage out and the bearing was starting to seize up. I applied some oil to both bearings for several days and it has been working fine for 3 years.

Reply With Quote
Old 12-04-2010, 08:36 AM
ShaggyDiesel's Avatar
Let the Wookie win...
Join Date: Sep 2010
Location: Litchfield County, CT
Posts: 28
I've been having problems with mine as well, check your fuses first (IIRC #8 16 amp (red)), the CCU may have fractures in the solder contacts, also the heater control unit may have crapped out.
All gave some, Some gave it all ~ 9-11-2001 Never Forget

People shouldn't fear their Government, The Government should fear its people.
Reply With Quote
Old 12-04-2010, 09:02 AM
vstech's Avatar
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,180
my SD has the blower fuse at #11 and it's a blue 25 my fuse kept melting so I did the MB upgrade to an external fuse. if your fuse is melting you need blower bearings.
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
Reply With Quote
Old 12-04-2010, 09:12 AM
Scott98's Avatar
Registered User
Join Date: Aug 2003
Location: Weston, FL
Posts: 1,254
Originally Posted by jt20 View Post
Replace the fuse on principle unless you want to get digging right away.
+1. These fuses are exposed to the elements and oxidize over 20+ years. They will cease working even though they aren't blown. Replace them all with new ones. It isn't expensive. Do the simple stuff first before potentially wasting time on more difficult problem solving measures.

1982 Mercedes 240D, 4 speed, 275,000
1988 Porsche 944 Turbo S (70,000)
1987 Porsche 911 Coupe 109,000 (sold)
1998 Mercedes E300 TurboDiesel 147,000 (sold)
1985 Mercedes 300D 227,000 (totaled by inattentive driver with no insurance!)
1997 Mercedes E300 Diesel 236,000 (sold)
1995 Ducati 900SS (sold)
1987 VW Jetta GLI 157,000 (sold)
1986 Camaro 125,000 (sold - P.O.S.)
1977 Corvette L82 125,000 (sold)
1965 Pontiac GTO 15,000 restored (sold)
Reply With Quote
Old 12-04-2010, 01:18 PM
Jeremy5848's Avatar
Registered Biodiesel User
Join Date: Mar 2006
Location: Sonoma Wine Country
Posts: 8,393
And use copper fuses, not aluminum.

Mercedes blowers tend to operate right at the limit of their fuse as they come from the factory. As the blower ages, the bushings wear and get contaminated with dirt. This puts more load on the motor and causes it to slow and draw even more current.

"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 04:33 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page