Title: Inspect and test heater control valve(s); determine needed action.
Course: Automotive Technology III (20104-III) > Section: Heating, Ventilation, and Air Conditioning (HVAC): Heating, Ventilation, and Engine Cooling Systems Diagnosis and Repair

Procedure should include

- ensuring control lever moves with control head command
- referring to service information for additional test procedures.

ASE Education Foundation
2017 Automobile Service Technology (AST) Level
VII. Heating, Ventilation, and Air Conditioning (HVAC)
C. Heating, Ventilation, and Engine Cooling Systems Diagnosis and Repair
Task 2

Process/Skill Questions:

- If the vehicle is equipped with a heater control valve, where is it typically located?
- What is the corresponding customer complaint for a control valve that sticks in the closed position?
- How would the control valve affect the vehicle if the valve was stuck in the open position?