Why Is My Heater Blowing Cold Air?

With temperatures dipping below freezing, now is the worst time to be dealing with car heater issues. For those who haven’t been keeping up with their cooling system maintenance or HVAC system maintenance, you may notice your vehicle struggling to warm up. So, if your car heater is blowing cold air, keep reading to learn what could be causing the problem.

Low Coolant Levels

The vehicle heater is directly linked to the cooling system, which is what you may come to find as you read this blog. The coolant absorbs the engine’s excess heat and brings it all the way to the heater core to warm up the air that will eventually reach the cabin. If there isn’t enough coolant, you will feel cool air instead of warm. Low coolant levels can be due to anything from worn seals, damaged gaskets, or leaky hoses.

Stuck Thermostat

The thermostat is also a crucial part of the cooling system. It monitors engine temperature to let your vehicle know when it needs more coolant or less coolant. If it is stuck or has incorrect readings, coolant will not make its way to the heater core to warm up your car.

Heater Core Issues

Another place that our technicians will look is the heater core. This component consists of tubes and fans to disperse the heat carried by the coolant. If the heater core is failing or clogged, your heater and defrosters will not work. 

Faulty Blend Door

The blend door is a part of the climate control system, and it moves temperatures between hot and cold. While this is more of an uncommon problem, it is always a possibility for the door to get stuck.

Water Leak

Water leaks in the HVAC system are no joke. A minor leak can go unnoticed and worsen to cause permanent damage. If your heater is leaking water, from the gasket, hose, water pump, or other surrounding areas, you won’t receive the warm air you were hoping for. 

Broken Controls

The switches and dials that control your passenger cabin may also be the problem. If these commands don’t trigger a response, your car’s temperature will not change.

If your heater can’t keep you warm inside your car, SUV, or truck this time around, please bring your vehicle to the auto repair specialists at Community Auto. 

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