what causes the fan motor to fluctuate while driving? my heater works so does the a/c
415

Asked by Robert Mar 13, 2013 at 01:19 AM about the 2002 Pontiac Grand Prix GT Coupe

Question type: Maintenance & Repair

2002 Pontiac Grand Prix GT 2dr 3.8L 239k

5 Answers

migration_judge_roy answered 11 years ago

well there is a little goodie called the 'fan clutch' in front of the radiator, in fact is an additional fan...sorta, speeds up when the moto is hot, and cools down when the motor is cool. It's job is to vary with temperature.

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tenspeed answered 11 years ago

If you are asking about the blower fan motor for the HVAC system, it means that the brushes are too short and the motor needs to be replaced. It's a very easy DIY job on most GM vehicles. Three small screws and a electrical connector.

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