How do I fix a car heater blowing cold air?

Last week I turned my car heater on and it blew out cold air. No matter how high I turn the heat up, I feel cold air. How do I fix a car heater that keeps blowing cold air?

Talullah Blanco · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
Oh no! Having a working heater is an essential part of your car. The heater core will blow cold air if there isn’t enough coolant in the engine, the thermostat isn’t working, or the heater core is clogged. How you fix a heater blowing cold air depends on the cause of the issue. These are the top three reasons your car heater is blowing cold air and how to fix them:
  • Low coolant level. Check the fluid level in your coolant reservoirs. If it is low, top off the coolant to fix your car heater.
  • Faulty thermostat. If your thermostat is not working, it can’t signal the engine, and the coolant won’t provide heat to the heater core. You’ll have to install a new thermostat to fix your heater.
  • Clogged heater core. A professional can flush a clogged heater core passage, or you can remove any debris from the heater core exterior to get your heater working again.
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