Truck Сustomizers Equipment Why Does a Car Heater Work Intermittently?

Why Does a Car Heater Work Intermittently?

Every vehicle is equipped with a car heating system that helps keep the cabin warm and comfortable on cold days. The car heater works by utilizing heat from the engine’s coolant fluid and then blowing it into the cabin as hot air or water vapor. It is important to know how your car’s heater works intermittently in order to prevent any problems that may arise due to its malfunctioning.

Causes of an Intermittent Car Heater Working Condition

Various factors can cause a car heater to work intermittently, but the most common ones include:

  1. Leaking Coolant Fluid – If there is a leak in your coolant fluid, it can cause insufficient heat transfer through the engine, resulting in an intermittent working condition for your car’s heater. This issue can also be caused by incorrect installation or damaged components such as hoses or thermostats.

  2. Faulty Thermostat – A faulty thermostat may be responsible for an intermittent working condition of your car’s heater due to its inability to accurately regulate the flow of the coolant fluid throughout the system. It is important to regularly check and replace any faulty thermostats to ensure that your car’s heater works efficiently and properly.

  3. Clogged HVAC System – A clogged HVAC system can cause the air flow in your car to be limited, resulting in a decrease in temperature and intermittent working of the car’s heater. This problem can be easily fixed by clearing away any blockages from the system and/or replacing any worn out or damaged parts.

Why Does a Car Heater Work Intermittently

Common Signs That Show Your Car’s Heater is Malfunctioning

If you notice any of the following signs, it is likely that your car’s heater is malfunctioning:

  • Unusual noises coming from the vents or when you turn on the heat switch

  • Lack of warm air or water vapor coming out of the vents even after a few minutes of operation

  • The engine temperature gauge not working correctly

  • An odd smell coming from inside your car

These warning signs should be taken seriously as they indicate that there may be an issue with your car’s heating system and it is best to have it checked by a professional mechanic as soon as possible.

Tips to Fix an Intermittent Car Heater Problem

If you find that your car’s heater is not working intermittently, here are a few tips to get it back on track:

  1. Inspect the coolant fluid level and top it up if required.

  2. Check the hoses and thermostat for any signs of damage or wear and tear.

  3. Clear away any blockages from the HVAC system and replace any worn out parts if necessary.

  4. Make sure that the cabin air filter is clean and replace it regularly as recommended by your car manufacturer.

  5. Have a professional mechanic inspect your car’s heating system to identify any underlying issues that may cause an intermittent working condition of your car’s heater.


An intermittent working condition of a car’s heater can be caused by various factors, so it is important to understand how they work in order to prevent any problems from occurring in the future. By following some simple tips such as checking the coolant fluid levels, inspecting the hoses and thermostats for signs of wear, cleaning out blockages from the HVAC system, or having a professional mechanic inspect your heating system, you can ensure that your car’s heater is working properly and efficiently.

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