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I can't give you a real specific answer, but fuses blow because something is drawing too much current. The major electrical part of the heating system is the blower. There might be a shorted winding in the motor, or maybe the motor bearings are going bad and are dragging. This can cause an over-current condition too.
I suspect you need to replace the motor.
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∙ 12y ago
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Where to locate heater fuses for a 2001 Pontiac grand prix?
where to locate heater fuses for a 2001 grand prix gt
Why does your heater and air keep blowing fuses cannot run it without blowing fuses?
There is an electrical short to ground in the fan switch or in the blower motor itself.
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How do you replace fuses on a 2001 Pontiac Sunfire?
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Why would the fuses for the heater keep blowing in a 1985 Blazer?
Beause there is probably a short/bad connection in the switch, or the blower motor itself
