The radiator and heater core act like small heat exchangers ... but the hose from the valve to the heater core (the hose that goes into your car) is cooler, the valve is in the closed position.

The heater core is a small radiator that warms the car’s cabin using hot coolant from the engine. The cooling system’s hoses circulate liquid coolant through the heater core as they do through ...

Coolant hoses are a vital component of any vehicle’s cooling system, but they often get overlooked during routine maintenance ...

Find out if there are any recalls on your car. Heater hoses are rubber hoses that circulate engine coolant to and from the heater core, which is the small radiator that provides heat for the cabin.