Aurora V6-214 3.5L VIN H SFI (2001)
Coolant Temperature Sensor / Switch HVAC: Description and Operation
Engine Coolant
Engine coolant is the key element of the heating system. The normal engine operating coolant temperature is controlled by the thermostat. The
thermostat also creates a restriction for the cooling system that promotes a positive coolant flow and helps prevent cavitation.
Coolant enters the heater core through the inlet heater hose, in a pressurized state. The heater core is located inside the HVAC module. The heat of the
coolant flowing through the heater core is absorbed by the ambient air drawn through the HVAC module. Heated air is distributed to the passenger
compartment, through the HVAC module, for passenger comfort. The amount of heat delivered to the passenger compartment is controlled by opening
or closing the HVAC module air temperature door. The coolant exits the heater core through the return heater hose and recirculated back through the
engine cooling system.