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#1
02-10-2010, 08:33 AM
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Blower motor fuse keeps blowing
I have a 1978 300CD that keeps blowing the fuse for the blower motor. The servo unit is currently bypassed. The defroster has worked just fine until a couple of weeks ago. Now, a fuse may only last a few minutes. I'm not sure where to start looking for a short or another cause. Any help would be greatly appreciated.
__________________
"If we can't have fun while we're here, we might as well go to the house". 1978 300CD 1985 300TD 1999 Land Rover Discovery II rover1@sbcglobal.net 
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#2
02-10-2010, 09:30 AM
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The brushes in the motor could be worn or worn out. Or, the bearings in the blower motor could be dry. Pretty simple to check these things.
Is it actually "Blowing the fuse" (melting the metal strip)? Or is the plastic part of the fuse melting?
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AJ 1985 300D (SOLD) 
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#3
02-10-2010, 10:06 AM
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Looks like it is melting the fuse itself, rather than the strip.
__________________
"If we can't have fun while we're here, we might as well go to the house". 1978 300CD 1985 300TD 1999 Land Rover Discovery II rover1@sbcglobal.net
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#4
02-10-2010, 10:57 AM
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first, get some ceramic fuses, they'll last a bit longer than the plastic ones.
then clean the crap out of the fuse holder, get it really bright, I use scotchbright scrubbs... but that will only delay the problem. you have to pull the blower motor and repair or replace it. get some electrical spray, and clean out the bearings, and pack in some lube, and you should be OK for a little while unless the bearings are totally gone. if they're gone, you gotta bite the bullit and get a replacement motor.
__________________
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 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#5
02-10-2010, 11:40 AM
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I'll agree with pulling the motor and inspecting, especially the brushes. When worn down severely, it'll draw more amps, blowing the otherwise properly rated fuse.
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83 SD 84 CD
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#6
02-10-2010, 11:43 AM
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And how big a deal is that to do, pulling and such?
__________________
"If we can't have fun while we're here, we might as well go to the house". 1978 300CD 1985 300TD 1999 Land Rover Discovery II rover1@sbcglobal.net
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#7
02-10-2010, 11:45 AM
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Shouldn't be difficult at all. I pulled mine in the SD. Remove the lower kick panel below the glove box, the plastic screw on the transmission hump is a 90 degree thing, just turn it a bit, it'll probably stay on the kick panel. Look up, you see three to four screws, remove them and work it off.
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83 SD 84 CD
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#8
02-10-2010, 12:58 PM
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Dirty or worn bearings make the motor resist spinning, which will also blow a fuse due to higher amperage draw.
__________________
RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D
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