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
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2 answers
ANSWER by , 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 , January 03, 2012
Bad thermostat.