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2001 Pontiac Grand Prix Question: No Heat



bradb571, 3.8L V6, Naples, FL, January 02, 2012, 20:46

I'm not getting any heat in the car. The a/c seems to be working fine. No overheating issues. Antifreeze is full.
Any ideas??

2 Answers
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  • Medium-star Best Answer
    January 02, 2012, 21:01

    Customer Concern: No heat, both heater core hoses hot. Manual Heater Vent Air Conditioning (HVAC) system.

    Tests/Procedures: 1. Test voltage backprobed at the temperature door actuator Brown wire ignition power, Yellow wire ground, Dark Blue wire control 0-12 volts. If there is a Light Blue wire it is not used.

    2. Test terminal contact.

    3. Remove temperature door actuator. Test for stuck temperature door.

    4. Replace temperature door actuator.
    Tech Tips: Temperature door actuator is located behind right side of dash behind and left of blower motor housing on end of the HVAC housing.

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  • Answer #2

    January 03, 2012, 05:40

    Bad thermostat.

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