Why is my Car Heater Blowing Cold Air?

 

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Low Coolant Level

The coolant (usually a mixture of water and antifreeze) in your engine doesn’t just work to keep the engine from overheating: It’s also the source of heat supporting the heating system. If there isn’t enough coolant in your system, the heater core will blow cold air into your car.

Solution: If you confirm that a low coolant level is the source of your problem, you simply need to top off your coolant. You may want to check for leaks as well if you just recently refilled your coolant. 

Thermostat Not Working

Does your thermostat stay on the “C” even after the engine has had time to heat up? If so, you may have a broken thermostat. When the thermostat can’t signal that the engine is warm, the coolant won’t be sent over to provide heat to the heater core and the air will blow cold.

Solution: You need to install a new thermostat to get your heater working again. It’s a relatively quick and easy fix.

Heater Core Problems

Heater cores are cooling systems that look like compact radiators. They are made up of metal tubing that carries hot coolant in and out as well as fans that disperse the heat released by the coolant. If your heater core is clogged or has other problems, you may notice these signs:

• Sweet-smelling odor
• Engine overheating
• Fog in the car’s cabin
• Car uses up coolant quickly

Solution: A clogged heater core passage can be flushed out, and a clogged heater core exterior can be manually cleaned by removing any debris that clogs it. In some cases, you may need to install a new heater core. 

Jammed Blend Door

Could the culprit be a jammed blend door? This feature allows the air to move from the heating system to the vehicle internal. If it is jammed, the air bypasses the heater core, leaving you with a car heater that blows only cold air.

Solution: You will need to have the blend door replaced. Usually, a jammed blend is fixed along with other, bigger repairs, such as water pump replacement.

Schedule Car Heater Repair at Brown-Daub Kia

It’s high time your car heater stopped blowing cold air. You need a set of wheels that’s always ready on chilly mornings and in the most frigid winter weather. Never let your heater fail: Set up a car heater repair appointment at our authorized service center.

We’ll have you ready for the roads of Easton, Allentown, and Quakertown, PA, again in no time at all. Let our certified technicians get to work immediately!