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Old 12-08-2009, 07:39 PM
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Join Date: Jan 2002
Posts: 18,355
Heater blower motor fuse

High today 10 degrees. Predicted to be -8 degrees in the am. Not a good time for the blower motor fuse to go out on the W116 as my wife is driving home from work. Put a new fuse in but I'd like to know what people think are the possible causes of fuse failure. I don't think the fuse protects anything but the blower.

1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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Old 12-08-2009, 07:43 PM
compress ignite's Avatar
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Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
Posts: 5,554

The Fuse protects the Wiring (AND the Supreme Commander) from FIRE!

Older Blower Motors = Lube Lack in Bushings = Increased Amp Load = Higher
Resistance in ALREADY undersized Wires = Fire.

Older Blower Motors = Brush wear = higher amp load = Same.Same.
'84 300SD sold
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Old 12-08-2009, 08:15 PM
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Join Date: Feb 2009
Location: Treasure Coast, FL
Posts: 1,417
I just went through this with my car. Although a different chassis.... Same problem. Resistance has built up somewhere.

I found that the "blower fuse" was getting really hot when the blower speed was on any speed but low. It would burn your finger. However, the "blower resistor" was cool to the touch. Not even warm. I had recently pulled the motor and inspected the windings/brushes and lubed the bearings/bushings.

I suspect that beyond problems with the motor itself, the problem would lie withing the wiring. Either a broken wire (short) or something else.

I ordered some copper/ceramic fuses for mine to see if that helps. Ever since I cleaned the contacts in the fuse block, applied dilectric paste and put a new fuse in there.... It has been fine. BUT, that fuse still gets really hot.


1985 300D (SOLD)

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