Question about 1994 Pontiac Grand Am

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94 Grand Am SE 3.1. The blower fan barely works. I replaced the fan motor and fan resistor. I also read a post that said take out blower and clean front of evaporator. Well, I tried this but couldn't find evaporator through blower motor hole. Anyhow, the fan occasionally will work normally. But for the past week almost no airflow, although I can hear the blower running. Also I checked under the dash and the plate that moves when you turn on ac is working. I am stumped.

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If the airflow is normal sometimes then that most likely eliminates blockage in the evaporator as the culprit. If it were blocked the problem would be continuous, not intermittent.

If you're sure that all of the duct system actuators, and valves (doors) that redirect airflow to the desired vent are working correctly then I suggest that you check the controls and wiring.

The blower switch may be faulty, or have loose or damaged wiring.

Posted on Mar 21, 2011

Testimonial: "I am still working on it but that is a pretty good answer. I really think a duct valve is intermittent."

  • Mike B Mar 21, 2011

    Hi Tecno,
    I am not sure all the valves are working, just the one I could see. I don't know where the others would be.

  • John
    John Mar 22, 2011

    The valves are all inside the duct system/plenum up under the dash. To locate them most likely will require some dash disassembly. From the outside of the duct you can usually locate the valves by looking for wiring, or vacuum line connections that will be attached to the valve actuators. You can check the actuators by removing one at a time and watch it while operating the mode controls to confirm if it is functiong. While each actuator is removed, manually operate the valve arm that the actuator engages. You should feel slight resistance , and be able to hear the valve moving inside the duct if it is functioning correctly.

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Try replacing the in cabin filters for the heater.

Posted on Mar 21, 2011

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