It acts like a small radiator to warm the interior. Warm/hot coolant from the engine circulates through it, while air blows across it. This air is warmed by the coolant, then is directed into the passenger compartment to warm the car.
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A high pressure will be able to push the coolants into the heater cores.
The heater core can leak get pluged up or simply wear through with time. When they leak it will probly leak engine coolent into the cabin of the car or truck. When they get pluged up your heater will not heat the car and the coolant system of the car will not operate properly to cool the car.
If it has rear heat it has two heater cores. One in the front and one in the back.
A vehicle block heater's main purpose is to warm an engine enough to increase the car's starting speed. This is especially useful in winter to get a car started.
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Called a Heater Core in North America. This is a little radiator to make the air in the car warm
The 2003 Chevrolet Trailblazers has two heater cores. One operates the front area of the vehicle while the other heats the rear of the vehicle.
replace front heater corefront and rear have independent heater cores
There are 2 if it is dual climate control
Heater cores in all vehicles are up under the dashboard inside the vehicle.
To replace most heater cores you have to remove the dash on the passenger side.