A car heater is a blessing that makes it easier to drive a car in a freezing season. If your car heater starts blowing cold air instead of hot, you will be very frustrated. These types of car issues are a headache. Car heater blowing cold air can make your winter months unbearable for driving. Sometimes the problem isn’t a big one, but finding it is not easy. The first thing that you should see is if the engine is running because the heater utilizes engine heat for heating the interior. Some other common problems and their solutions are given below.

Car Heater Blowing Cold Air

#1 Engine Thermostat Problems

A thermostat works as a valve that opens and closes as required. A bad thermostat can be stuck in an open or closed position. If it is stuck in the closing position, the engine coolant will overheat and can get destroyed. So there will be no hot coolant running through the heating core, and hence the heater won’t blow hot air. In the case of open position stuck, all the coolant in the heating core will be cold, and hence again, the heater will blow cold air.


In the case of this problem, you need to install a new thermostat. A new thermostat will cost you $30 to $60 apart from labor costs.

#2 Coolant Level Insufficient

Coolant fluid is responsible for the heat in the heating system. If there is less coolant, then the heating system may not get sufficient heat, so the heater will not blow hot air. Low coolant levels can be due to leaks in the hoses or connections


You need to add the required amount of coolant. If the coolant level still gets low, it is an indication of leaks. Take the car to the mechanic to get the leaks fixed.

#3 Blend Door Jammed

There is a blend door in the heating system from which the air flows from the heater to the car’s interior. If the blend door gets stuck or jammed, it can result in only cold air coming in the car interior as air will bypass the heater core due to a faulty blend door.


If you find the blend door faulty, you need to replace it for proper working.

#4 Bubbles in the Coolant System

If the coolant fluid has air bubbles in it. It can also cause the heater to blow cold air. It is because the heat cannot be adequately transferred to the coolant, which causes the failure of the car heater.


To get rid of air bubbles, you need to set the heating system to the maximum level and remove the coolant tank’s cap. Fill the coolant, fire the engine, and let the engine stand idle for a few minutes. In this way, you can remove air bubbles.

#5 Heater Core Issues

A clogged heater core can also cause this problem. The heater core or heater external can get clogged due to debris or other particles. It can hinder the coolant from running through it, causing the heater core to remain cold.


You can flush the heater core to clean it from the debris. You can remove debris from the exterior manually. If this doesn’t solve the problem, you may need to install a new heating core.

#6 Heater Controls Issues

Sometimes the heating controls can be the culprit for car heaters blowing cold air. The buttons can fail due to overuse or misuse.


The faulty heating controls or buttons need to be replaced.

So, it is difficult to find such issues, so getting expert help is always recommended. It’s better to spend a little more money than messing everything up.

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