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Why is my car overheating and no heat coming from my heater?
My car’s heater blew cold air this morning and never warmed up, no matter how long I waited. After a few minutes, I noticed the engine temperature was climbing rapidly—but it was freezing outside! How can the engine be overheating without any heat coming from the vents?
Melanie Krieps Mergen · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
It may seem counterintuitive, but when your coolant system is on the fritz, it’s not uncommon for the engine to run hot and the heater to blow cold.
Coolant normally flows around your car’s engine, absorbing the excess heat and passing it to the heater. The heater then pushes warm air through the vents. A faulty coolant system does neither.
If you’ve got a problem with your coolant system, the cause could be:
- A blockage in the heater
- A broken thermostat
- A faulty or damaged blower motor
- Faulty heater core bypass valve or hoses
- Low coolant levels
Driving your car when the engine is overheating could cause irreparable damage to one of the most expensive parts of your car. For a quick fix, check your coolant levels and add some liquid. If that doesn’t work, it’s time to call for a tow to the nearest garage.
View full answer
- Gregory R.
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