Skip the auto shop - Our mechanics make house calls

Q: Ac compressor. Blowing hot air through front vents and cold air through rear vents.

asked by on

Recently fixed ac relay at dealer as it was fuming and making noise. Now, it is blowing hot air in the front vents but blowing cold air on rear vents. Went to dealer to diagnose and they are saying I need to replace ac compressor condenser and all other parts as it has gone bad.

Pls advise.

My car has 190000 miles.
My car has an automatic transmission.

It sounds to me like you have a blend door actuator problem. The blend door actuator is responsible for controlling the blend door. The blend door is responsible for blocking off air to the heater core when your air conditioning is on. I would recommend having your blend door actuator tested using the manufacturer’s recommended procedure. Once this has been done, a qualified mechanic will be able to inform you of whether the actuator will require replacement in order to resolve this issue. If you need help with this repair, YourMechanic offers a repair and diagnosis service preformed by a certified mechanic that will commute to your location to look inspect your heater and AC problem.

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!
  • Home
  • Questions
  • Ac compressor. Blowing hot air through front vents and cold air through rear vents.

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: Clicking sound when turning over.

Hi There, Generally a clicking sound when turning the key indicates a weak battery or a faulty starter solenoid. I would suggest double checking the power to the battery. Even new batteries purchased right off the shelf can at times...

Q: Heater only working part of the time.

We need to determine if your blower is blowing air or if the air coming out is not hot. If you feel heat coming through any of your vents, even a tiny trickle of heat, then your heater core is...

Q: AC quit working

Hello. The symptoms you are experiencing can be caused by a variety of issues. The first thing I would check is the pressure of the system, as a system that is low on refrigerant may not produce cold air. I...

Related articles

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...
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...
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...