Skip the auto shop - Our mechanics make house calls

Q: The AC only cools the passenger side

asked by on

I have a 2007 Chevrolet Malibu with the 2.2 l4. Three months ago, I had the compressor, condenser, and expansion valve replaced, since the compressor had failed and it is recommended to replace all of those when it does. Lately, as it's gotten hotter (over 100) I've noticed that the air coming out of the passenger side vents are measurably colder than the driver side. The car is a single zone system, so it only has one control for the whole car. I checked the refrigerant levels, and they were slightly too low, but recharging the system didn't change anything. I'm trying to figure out what I can do to fix this, since the temperature is going to be over 110 all week, and I can't drive like that. The whole system works, it is cooling the air, but the cold air isn't reaching the vents on the driver's side. Going from right to left, it gradually gets warmer. What can I do?

My car has 161174 miles.
My car has an automatic transmission.

A: Considering that many a/c system components...

Considering that many a/c system components were recently replaced and that the refrigerant level is correct, you may have an issue with your blend door actuator.

This actuator will block off the air flow to either the evaporator or the heater core. This is the door that you are adjusting when you are moving the temperature control switch. If this door actuator is not functioning properly, the door may not be fully opening to expose the evaporator.

Since the evaporator is almost always located under the dash on the passenger side, this could be why the passenger side is still able to get cool air.

I would recommend getting your AC system inspected and having your blend door actuator inspected and replaced if necessary in order to resolve this issue.

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・Save up to 30%

Get a quote

What others are asking

Q: Does Running My AC in the Summer Keep My Engine Cooler?

Automotive air conditioning (AC) will cause the engine to run hotter in the summer because it creates more heat in the engine compartment and there will be more strain on the engine to operate the AC compressor. The AC compressor...

Q: Catalytic converter bad.

Catalytic converters do have a federal required warranty that most people are unaware of, talk to your dealer to find out if you are still covered. Early catalytic converter failure can be cause by other factors including coolant contamination can...

Q: Cooling temperature sensor light on.

Coolant temperature sensors generally will not record fault codes in the engine computer or turn on the Check Engine light unless they completely fail by either a short or open circuit. When the coolant temperature sensor fails completely you will...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...