Heater valves are one of the many components responsible for warming the interior compartment of a vehicle. By allowing hot coolant from the engine to flow through the heater core, a properly working heater valve ensures maximum HVAC comfort and performance.
Before replacing a heater valve, inspect the following:
Evidence of a leaking heater valve results in loss of coolant and will eventually lead to an overheated engine, therefore should be replaced.
When replacing a heater valve, it is important to inspect or replace all heater hoses when necessary. Heater hoses will deteriorate over time.
If the heater valve shows evidence of corrosion, it is recommended to replace the unit and flush the system.