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#1
11-21-2008, 04:15 PM
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heater switch on '87 300D
I suspect that the heater switch in my wife's '87 300D is faulty. A short time ago, it was behaving funny: the high blower setting would not activate on any of the environmental modes except for defrost. Once it was one, then I could swtich to another modes (i.e. floor/defrost combo).
Anyway, now the blower does not respond to any of the controls. What is the best way to diagnose if the problem is in the switch? In an earlier post, someone mentioned a relay that might need to be replaced.....not sure how to locate that relay. Any ideas are appreciated. Thanks -harv 
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#2
11-21-2008, 04:28 PM
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check the strip fuse under the hood, drivers side
__________________
'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!
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#3
11-21-2008, 05:19 PM
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If you jump over to the Tech forum, testing the speed-control unit and fan was recently discussed and detailed for the 124.
Provided the strip fuse is good, you will need to determine whether it is the motor drawing too much current or binding (likely), or the speed control (least troublesome), or the control unit in the dash (most espensive).
__________________
 Gone to the dark side - Jeff
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#5
11-22-2008, 01:36 AM
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I just purchased a motor/blower array for my 201 and the symptoms were at first, screeching, then it would work only on full blast, then it started blowing fuses. I have yet to receive the replacement blower assy., and I tried replacing the fuse yesterday in blowing rain here in Portland. After working just on high for a while, with a little screeching, it blew the fuse again.
I suspect it is a dead or dying blower motor as well.
__________________
327K on 1986 W201, 602.911, 722.414 2.5 190D ("The Red Baron") 139K on 1993 W124, 104.942, 722.433 2.8 300E ("Queen") http://farm5.static.flickr.com/4081/...0bb92d3c_m.jpg http://i370.photobucket.com/albums/o...g?t=1325284354 Do not worry about your difficulties in Mathematics. I can assure you mine are still greater. - Albert Einstein take a walk down memory lane...
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#7
10-23-2009, 12:36 AM
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My fix was not as easy, but I got heat in my car for the winter, and that is what counts
 .
__________________
327K on 1986 W201, 602.911, 722.414 2.5 190D ("The Red Baron") 139K on 1993 W124, 104.942, 722.433 2.8 300E ("Queen") http://farm5.static.flickr.com/4081/...0bb92d3c_m.jpg http://i370.photobucket.com/albums/o...g?t=1325284354 Do not worry about your difficulties in Mathematics. I can assure you mine are still greater. - Albert Einstein take a walk down memory lane...
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#8
10-23-2009, 12:39 AM
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However, the strip fuse didn't cause the original problem, starting on Defrost only. That problem is typically caused by worn brushes and/or commutator in the motor itself, which cause the excess current that blows the strip fuse.
__________________
 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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