No Heat on 2001 Pontiac Grand Prix

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?? Thanks

by in Naples, FL on January 02, 2012
2 answers
ANSWER by on January 02, 2012
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.
ANSWER by on January 03, 2012
Bad thermostat.
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