Why is My Car Heater Not Working?

Almost all modern cars have a heating system that is crucial to keep them warm on a snowy morning. Therefore, It is no fun getting into your automobile on a cold, wintery morning only to discover the car heater is blowing cold air.

It is practically displeasing to have an electric heater for the car if it is not providing sufficient heat. An undependable heater can make the bitterly cold winter months intolerable. Numerous things can go wrong with the plugin car heater.

A car heater uses a coolant to keep the car warm. Just like a home heater, there are various components including a heating fan, coolant, core, and HVAC functioning together to heat your vehicle. If any of these issues exist, your heater will not work properly.

To fix car heaters, we first need to know the main culprit behind this issue. In this guide, we will notify you about the causes of why your car heater is not blowing hot air.

Why is Car Heater Blowing Cold Air?

These are the most common reasons your car warmer is not working properly and blowing out cold air.

Faulty Thermostat

If the temperature meter of your automobile points at C even after the engine has got adequate time to warm up, you have a damaged thermostat.

The vehicle’s cooling system might not start in this condition. The heating system’s core will not procure any coolant; it won’t send warm air inside the cabin.

You can easily troubleshoot the thermostat, and it does not cost too much.

Blocked or Damaged Heater Controls

Automotive tips for winters

Sometimes control buttons get gummed up and stop functioning. If the coolant levels are satisfactory and there is nothing wrong with the heater core, you may need to change the control valve or a few control buttons.

The control valve is positioned beneath the hood and works as the switch that is responsible for turning the heat on and off.

If it is not operating properly, your vehicle could blow cold air into the cabin.

Heater Core Problems

Another cause of why the car heater not working is the heater core.

Your vehicle might have enough coolant level, but the core might be obstructed.

The coolant that comes into the core requires an appropriate route to travel. If the core is blocked, the heater will not operate at all. The core is liable for the car’s defrosting and heating actions and the coolant liquid’s smooth movement.

There are many other symptoms that signify a defective heater core.

The core is the culprit if the coolant level is normal, but your engine is overheating, or your coolant gets consumed swiftly. If you are experiencing frequent fog inside the cabin, it also indicates that the core is defective.

Low Coolant

Most people ignore the coolant or antifreeze when they complain or talk about no heat in the car. When car engines work too long, heat up, or the coolant is not filled properly, it shows a massive decrease in coolant level. It results in turning off its supply to the heater core and the car remains cool. Therefore, low coolant or antifreeze is another common reason for no heat in the vehicle while the heater is on.

car overheating coolant

How To Fix a Car Heater?

Heating repair or fixing the damaged heater of the vehicle is not a big issue when you know the reason behind it. Some possible solutions to repair the car heater are listed below.

Fill The Coolant

If your car heater blowing cool air due to low coolant, then increasing the coolant level to the appropriate level is the best solution to fix it easily. After leveling up the coolant, start the car and turn on the heating system to check it’s working.

Repair Leaked and Faulty Parts

Another simple and effective solution to fix car heaters, not working issues is to repair leaked and faulty parts. The reason is that often leakage causes a drop in coolant level and can also cause other problems if not fixed timely.

Go To Mechanic

If your car heater is not working after topping up the coolant level, then the best solution is to send the vehicle for professional service. They will inspect the vehicle thoroughly and fix the problem more accurately than you can at home.

FAQs About Car Heater Not Working:

What are the main Reasons for Heat not Working in My Car?

A car heater is one of the most crucial systems of the vehicle that helps you to keep warm and beat the cold when driving in winter. It can stop working due to multiple issues including, faulty coolant, damaged heating cores, low antifreeze, damaged blower motor, clogged core, faulty fan, thermostat, and wiring.

Whatever the reason, it needs to be fixed quickly. The reason is that damages or reasons responsible for the failure of a car heating system can also affect the performance of other systems of the vehicle.

Why Does Your Car Heater Only Work When Driving?

Heater coolant is one of the most crucial components of the car heating system. It blows hot air into the chamber and keeps it warm. A decrease in its specific level can result in stopping the heating system to work properly or you may notice that your heater only works when driving. It can happen due to an overheated engine, improper filling, and leakage of coolant.

The best solution to cope with this issue is leveling up the coolant and fixing the leakage.

What is Car Heating Repair Cost?

The exact number is not known because it depends on the type of problem, repair time, and required tools. Usually replacing tools costs more than fixing the old ones. However, repairing is a temporary solution and can cause the problem again.


An effective portable heater for a car can make your ride much more enjoyable.

If you notice a burning smell from the car heater or any of the issues mentioned above, contact a reliable local car heater repair shop to inspect your heater.

It is necessary to address heater problems immediately; otherwise, they may cause a costlier issue down the road.

If you want to read more automotive tips for winter, follow CarDecent.

Last Updated on March 22, 2023 by admin

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