Skip the auto shop - Our mechanics make house calls

Q: Hot air mixed with cold blows from air conditioning

asked by on

When my car has been sitting in the sun and is hot, instead of cold air coming from the air conditioning, I get hot air mixed with the cold from the two side air conditioner registers. When this happens, I have to shut down the two registers and switch on the extra air blower in order to divert the cold air to the center registers. The a/c duct in the back seat has no problem and it produces cold air at all times. I live in a hot climate where we have hot weather year round and I want to bypass all the hot water that goes to the cabin. How can I do this?

Hey there. You will most likely have to have a mechanic bypass the heater coolant lines to have this resolved. Your A/C may not be controlling the air flow inside the evaporator correctly out of the vents and may be the blend door actuator stuck in the heat position. Have the AC system diagnosed first before bypassing the heater.

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!
  1. Home
  2. Questions
  3. Hot air mixed with cold blows from air conditioning

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: Advice on using Lucas products

Hello there, thanks for writing in about your 1993 Chrysler LeBaron V6-3.0L. You are correct that fuel can gum up and the oil can form a varnish which coats parts of the engine over time. The best method for cleaning...

Q: Engine slows, shakes, clicks, and quits - 1993 Mercedes Benz 500 SEL

Hi there, thanks for writing in. The fuel pump relay is located in the trunk on the right side below and to the right of the computer module. I recommend replacing the relay first after checking connections for any corrosion...

Q: Floods bad when cold runs great when warms up

Hi. This problem is most likely caused by a faulty coolant temperature sensor, which is sending a signal to engine management that it is colder than it actually is. This causes engine management to inject more fuel than is needed...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...