Q: AC blows hot in the front, cold in the rear

asked by on

I had leaking condenser and compressor's O-rings and shredder's valves that I have replaced. I vacuumed the system for 2 hours and performed vacuum test for 30 min. Low side reading was between 28-30 and high side arrow never moved towards the zero - no leak. I have filled system with refrigerant (I noticed when I was done with third can 340gr each, I had some sign of cold air and when I filled with correct amount no cold air at all) and front is hot and rear is cold - really cold. I am in Vegas so it is hot. I was very confused as when the system was leaking all I had to do was add more refrigerant and I would have cold air for a few days but when I replaced everything to restore vacuum ac is not properly working. I had pulled error codes that there was no communication between ECC and DDM (I have 5 dumper motor modules) I erased the codes and performed identification of each DMM (via VIDA using DICE tool) and then recalibrated ( by the way all DDMs responded to all the buttons before

My car has 139000 miles.
My car has an automatic transmission.

Hello. It sounds like the blend door actuator is failing. This door is responsible for blocking off air flow to the heater core when the air conditioning is on. I would recommend having the blend door actuator tested using the manufacturer’s recommended procedure by a qualified professional to determine if it is functioning properly and the rest of the AC inspected in order to pinpoint the underlying problem. If the blend door actuator fails this test, I would recommend having it replaced in order to resolve this issue.

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. AC blows hot in the front, cold in the rear

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: Engine compression 1989 Volvo 740

Hi There, A failing manifold gasket could certainly contribute to a problem with the engine starting, however this would not necessarily go away when it warms up since it would be a constant leak into the intake system, which would...

Q: No air blowing and compressor not coming on

You may have two different problems or the a/c control switch went bad. The blower since it has power then the blower resistor or blower switch may be bad. For the compressor not coming on you would need to have...

Q: How do I disconnect angle gear from transfer case? I can't get to the three bolts on top

This is a very difficult process and oftentimes requires the use of a special puller tool to get the angle gear off of the gearbox splines. I would recommend having an expert assist in a project like this. ...

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...
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...