The heater core is a crucial component of a vehicle’s heating system, responsible for circulating hot coolant through the cabin to provide warmth to the passengers. However, like any other mechanical component, the heater core can fail over time, leading to a range of problems for the vehicle and its occupants.

If the car heater is not working, it will, either blow cold air or it will not blow air at all. If it blows cold air, then something is preventing the hot antifreeze from getting to the heater core.