Title: Test the heating system coolant control valve(s) and manual shut-off valves.
Course: Diesel Equipment Technology III (20107-III) > Section: HVAC: Servicing the Heating and Engine Cooling Systems

Testing should include

- complete operation of manual shut off valves
- verification that coolant control valves are operating by taking a temperature reading.

Process/Skill Questions:

- What is the purpose of the coolant control valve?
- What is the purpose of installing a manual shut-off valve in the cooling system?