Question about 2000 Pontiac Grand Prix
Pontiac grand prix 2000
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Posted on Jan 02, 2017
SOURCE: Blower works on 5 only
I don't claim to know why the lights are affected but when a heater blower only works on the fastest setting, it is normally due to the failure of a stepped series resistor which has taps to set the different speeds.
As emissionwiz stated, that is the most common cause.
This resistor may be mounted on the firewall under the hood or near the blower motor.
Without an electrical diagram at hand, I can't say for sure but there may be a relay failed that bypasses the resistor completely when set on the highest speed or diverts the current through the resistor.
Posted on Mar 22, 2009
SOURCE: 2000 grand prix fan speed
i have been having that same exact problem with my 2002 grand prix for over a year now, and when my ac is on the lower setting the it doesnt work plus the headlights and lights on my dash go out. On Max everything works. i changed the blower resistor(about $35), still doesnt work. i changed all relays and fuses related to the ac, still doesnt work. i changed out the actual ac control switch in the dash, still doesnt work. i have changed everything but the blower motor and have asked every mechanic and auto parts retailer i come across and no one knows the answer. The best answer i got is that it is probably a wiring problem like a short somewhere.
Posted on Jun 02, 2009
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