Pontiac Repair: Radiator Fan fuse 1 & 6 blowing, heater boxes, radiator fan

Question
I saw ur post of the ac blower fan resistor. My daughters 99 Grand Prix does the same, only blows on HI spd.

1. Could the fuse blowing be related to the shorted resistor?
When I replaced the fuses, the radiator fan came on at 210 deg and when I turned on the AC, the other fan came on. But shortly after that the fuses blew thus a dangerous overheating situation for my daughter while driving.
I plan to replace the resistor when it arrives at the parts store.
2. When replacing the resistor should I remove the battery cable?

Answer
Hi Peter:

I think you have 2 issues here. It's un likely the resistor for the blower motor is causing that fuse to blow. It's more than likely the blower motor that is making the fuse blow. The heater boxes in thes cars fill up with water and it rusts out the motor and the motor causes the fuse to blow. make sure the drain to the heater & a/c box is not plugged up. As for the radiator fan I'm not sure if each fan has it's own fuse or they share the same one. try unplugging one at a time and see which one is causing the fan fues to blow. my guess is the same thing you have one motor that is drawing to much current and is blowing that fuse. No you don't have to un hook the battery to replace the blower resistor.


Follow up:

I think you have issue with both fans one in the car for the heater and one of the ones for the radiator under the hood. Each one is run by a different fuse. I just can't tell you which one under the hood is the culprit that's why I said to unplug one at a time and let the car run and see which one blows the fuse. Just MAKE SURE you DO NOT OVER HEAT the car.