Heater Cores
The heater core is located inside the cab of the vehicle and is a critical part of the HVAC unit that keeps the inside of your vehicle at a comfortable temperature. As the coolant water mixture that is used to cool the engine is run through the tubes of the heater core, air from inside the vehicle is run over the evaporator's tubes. As the cold air from inside the car runs over the hot heater core, the air heats up and is blown back into the vehicle by a blower fan.