My wife's 1996 pontiac Bonneville fan runs in side blower fan run good sometimes then stops then run olny on low. I think it's fu*ked. Is it hard to change? do you have to just pull a part under the dash ??? All so sometimes many months a part her car inside lights, radio ,and more stop working then just start working again. only when its wet out!! Thanks for youe help. I'm a Ford GUY I have to Know my car inside and out HA HA My Old 1989 Mercury Grand Marquis Wagon with over 246000Km on it has less problems and less rust the pontiac has only 90 000Miles on it thanks
Justin

 

I think that is not a Do it yourself job for a FORD guy should ask assistance from an expert Pontiac mechanic to replace the fan motor, might cost a but if you don't have the elbow grease for that better pay for it.

 

I think you should investigate the blower motor resistor to start.