1. Let the truck sit overnight and check the coolant level in the radiator.
2. The blend door actuator should move regardless of the fan motor speed selection. Are you sure your looking at the blend door actuator?
3. The hot water valve on the heater hose should only receive vacuum (move) in max A/C or when the off position is selected. You can check the operation with a vacuum gauge.
Originally Posted by JBHandJr
we heard what sounded like air venting from under the hood. It lasted for a few seconds and then quit.
Does the air flow change outlets as selected (floor, vent, defrost) or stay in the defrost and floor only?