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.