Q: Why is my car blowing hot air and cold air at the same time?

asked by on

The other day i took out my HVAC system from the car trying to fix the LED screen, which I did not fix. After I but the system back into the car and took it for a drive the air started blowing hot and cold. It would blow hot air from the side vents towards the doors and the floor vents. It would also blow very cold from the center vents.

My car has 66000 miles.
My car has an automatic transmission.

The answer to this depends on whether you have switched on heating, cooling (A/C) or neither. In one scenario, for example, if you have not switched on the A/C system, but the A/C is running as confirmed by a visual check of the A/C compressor, and you are getting cool air obviously there is an electrical problem. The coincidental heating could be due to a blend door malfunction. If the only thing you did was remove electrical or electronic components, it would appear that you have an electrical malfunction in the controls. I recommend you request an HVAC diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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. Why is my car blowing hot air and cold air at the same time?

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: it over heat and now wont start and the engine oil looks like milkshake

Milky or milkshake-looking engine oil indicates the engine oil and engine coolant have mixed together. This can happen after a severe overheating of the engine. This mixing can happen from either the head gasket cracking, or the cylinder head itself...

Q: Blend doors not working properly.

Thank you for your inquiry. Your assumptions are very close, especially if your vehicle has a dual-zone system where the driver and passenger can enjoy different temperatures. Have a certified mechanic, like the ones at YourMechanic, inspect the system and...

Q: My 2005 MBZ SL500's dimming rear view mirror stays dark in daylight unless I turn on the adjacent overhead light.

What you are describing is likely a consequence of a failure of the ambient light sensor on the forward facing part of the mirror, although check to be sure that the light sensor is not somehow "blocked". The sensor is...

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...
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...
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...