Blower Override Switch: Description and Operation

Temperature Control Lockout Valve And Switch:

TEMPERATURE CONTROL LOCKOUT VALVE AND SWITCH
^ Its function is to prevent A/C blower motor operation when heating is required and the engine coolant temperature is below 45° C (113° F).
^ When the coolant temperature exceeds 45° C (113° F), the temperature control lockout valve and switch turns the blower motor on when heating is required.
^ The temperature control lockout valve and switch will not prevent A/C blower motor operation when cooling or defrost is required.
^ The temperature control lockout valve and switch is located in the heater water hose.