Q: Heat control blows hot then cold air

asked by on

Heat control blowing warm then cold air. While on heat.

My car has 4300 miles.
My car has an automatic transmission.

This may be due to a bad heater core. As you may know, the heater core is a small radiator like unit that circulates the hot coolant from the engine through the heater core which then uses this warm coolant to heat the inside of the car with the help of the blower motor that blows the warm air through the vents inside the car. I would recommend having an expert from YourMechanic come to your location to diagnose and repair your heater core.

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. Heat control blows hot then 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: How do I get the lower clamp off the radiator hose on the driver side? I can't fit anything in to squeeze It

Hi there, thanks for writing in. I'd be happy to help. The squeeze clamp may require a flexible squeeze clamp tool to get it off, if you can't get it off with a hose clamp. Hope this helps and best...

Q: Engine overheats, heater blows out cold air, coolant boils in radiator

Sounds like multiple problems here. I would first correct the "no heater" scenario. This is likely the heater control valve not allowing what is clearly hot water into the heater core. The reason for correcting this first is that it...

Q: Q: Car is making grinding noise

Hi There, It sounds like you may have a faulty starter solenoid that may be dragging a bit too long against the flywheel after the motor fires. This will cause the starter gear to engage the flywheel once the motor...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...