Skip the auto shop - Our mechanics make house calls

Q: Heater puts out hot air when set 80 degrees or higher, cool air if set lower

asked by on

I've owned this truck since new. At 90,000 had cooling system complete flush and fill and again at 180,000. I was wondering if it's the air control flow valve under the dash passenger side

My car has 230000 miles.
My car has an automatic transmission.

A: From what you describe it may be possible...

Hello.

From what you describe it may be possible that the issue is with the AC control switch or the blend door actuator. These are the components that are responsible for controlling AC temperature.

If they have any issues the AC system may still blow air but the temperature may not be correct. Another thing I would look at is the heater control valve, in the engine bay, as this is the component that allows hot coolant into the heater core to provide warm air.

If you’re unable to pinpoint the issue, consider YourMechanic, as one of our mobile technicians can come diagnose the issue with your AC firsthand and help you fix it accordingly.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Air conditioner not blowing cold air

Your air conditioning system may need to be charged and have a leak fixed on it. Over time, hoses may become damaged and O-rings need to be replaced in the system. The compressor also may start leaking out of the...

Q: Number 40 fuse blowing when cranking

I looked up the wiring diagrams for this year vehicle and cannot locate fuse 40. The instrument cluster lighting fuses are numbers from 10 to 17. I also cannot find any other problems that relate to your complaint that I...

Q: how can i tell if a control module has gone out

First, the connection to the battery must be checked to make sure the terminals are clean and tight. A poor connection here can cause a long list of problems. Try again with a good connection and charged battery. If the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...