Q: Engine gets hot, heater blows cold air

asked by on

The engine gets hot after running in town or on the highway, but the heater will blow cold air. Then the engine temperature will drop and the heater warms up, but only for a few minutes. Is it a water pump issue or just needs a new thermostat?

My car has 212000 miles.
My car has an automatic transmission.

Hi Ray. Thanks for contacting us today. When the engine gets hot and the heater blows cold air, it’s usually caused by either an obstruction of debris inside the heater core. When a water pump or thermostat does not work, it will typically cause overheating rather quickly - so it’s possible that you have a bunch of sludge collecting in the heater core. I think flushing your coolant system is probably the best way to start. If this does not resolve your issue, it’s smart to have a professional mechanic come to your location and complete an onsite inspection.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Engine gets hot, heater blows cold air

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Low idle in car

Hello. Your car can idle low from a number of reasons. If the check engine light is not on then it may be something simple. I would start by checking the air filter and replacing it if it is dirty....

Q: U-joint or CV shaft that is causing my vehicle to shake?

Hi there. The CV shaft that has a CV boot broken can cause a shutter or shaking vibration throughout the vehicle. This is when the grease has gone completely out of the CV shaft and make the ball bearings begin...

Q: Car died tried jumping it didn't work, Got a new start er and new battery but car won't start what's else could be wrong?

It is possible that this issue could be fuel-related. I would recommend having your vehicle inspected by a qualified professional to determine the exact cause of this issue. Consider YourMechanic as this can be done at your home or office....

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.