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What causes 50 amp fuse for blower motor to blow

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Posted on Jan 02, 2017

perkins48
  • 14337 Answers

SOURCE: heat, a/c blower motor does not blow, tried new resistor, and then new blower motor neither worked is there a fuse for blower?

Hi Mary,It seems you have replaced almost everything but the blower motor relay,here's a link to it and where it's at,if it doesn't fix,take back for a refund,hopefully it solves the problem.

Posted on Dec 18, 2012

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1 Answer

Blowing 50 amp high blower fuse instantly in 1997 3500HD sierra GMC.. all other speeds work except for High speed..


I would suspect a short in the blower motor. Lower speeds are through resistors, high speed is direct to the motor. Unplug the motor and try going through the speeds.

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50 amp blower fuse blows instantly


unplug blower motor see if it blows then if does the resistor board is gone in it that controls the blower fan high med. low switch

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Got a1996 gmc safari when i turn on the heater the fuse blows... its a 20 amp


The resistor is not the likely candidate for a fuse problem. There is either a short in the electrical wiring to the blower motor, or the blower motor itself is faulty, causing the fuse to blow. Disconnect the blower motor from the circuit and try turning it on. If the fuse doesn't blow, it's probably the motor.

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Why do i blow fuses when i turn on blower


this sounds like the blower motor is drawing more amps than the circuit is designed for causing the fuse to blow. disconnect the blower put in new fuse it probably won`t blow telling you that you need to replace the blower motor.

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Blower motor fuse


always start on a switch when they all they cause that

Nov 13, 2013 | 1998 Mercury Mystique

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Heater fan not working - 30 amp HVAC fuse blows out repeatedly when replaced. Where should I look for root cause? Have dash disassembled, but can't see any bare wires anywhere behind radio/climate...


Try unplugging the blower motor, heater control unit and blower motor resistor. Replace the fuse then reconnect the items 1 by 1 and see what pops the fuse.

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1992 gmc pickup keeps blowing heater fuses I replaced the blow motor and it keeps blowing


Have you replaced the blower resistor . some times they can cause the fuse to blow . You may need a muiltmeter to test the current draw on the blower motor circuit. the draw should be less then half of the rated fuse .( 20 amp fues draw is less then 10 amps) You did not say but does the blower work on high only or the lower speeds with out blowing the fuse ? if it does work on low or high with out blowing the fuse i would replace the blower resistor

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1999 mercury villager put in new blower motor and resistor. Every so often when change modes from defrost to lower for example or on start up it blows the front blower motor fuse. the blower motor is a...


it could be the electronic blend door motor. Try not changing any settings for a week and see if the fuse blows. Leave it on floor/defrost.

usually it is the bearing in the blower motor going bad. I believe it's a 25 amp fuse. The motor draws about one amp for each volt increase up to 14 volts.

go to our site for more help.

http://groups.yahoo.com/group/villagerquest/

Feb 02, 2010 | 1999 Mercury Villager

1 Answer

Blown Fuse


Hello Kilwillie.
Anytime a fuse blows the circuit is being overloaded.
There are a couple of fuses that control your blower. The 30 amp fuse link and a 10 amp fuse for the blower motor relay.
If it is the 30 amp the blower system needs to be checked for the cause of the short.
Positive battery voltage goes to the blower motor and the control switch routes the ground circuit through a resistor to give various fan speeds.
Most common will be the blower motor itself having worn motor shaft bushings or an internal motor short. This will require motor replacement. Also have seen where a mouse has built a nest and it gets caught in the blower fan causing it to overlooad.
If the wire after the blower was shorting to ground the blower would come on high speed and not be your problem

And if the fuse is the 10 amp it appears the fault may lie in the blower motor relay. I believe that would be the only logical solution according to the wiring diagram.

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1 Answer

Recently my wife was driving to work during a summer afternoon here in AZ THe A.C. and blinkers quit working, and blew out the blue-colored 15-amp fuse. I have checked what I know but cannot find the...


was this fuse for the a/c compressor or was it for the blower motor? did you replace fuse? did it blow out again? if blower motor fuse, blower motor may be dragging drawing excessive power, causing fuse to blow.

Jul 16, 2009 | 1999 Ford Crown Victoria

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