A/C Blows HOT HOT air from pass. side.

[02TB]

My 2002 Trailblazer LT blows hot air from the passanger side and rear and Ice cold from the drivers side front. I tried to sync the control modual by removing the HVAC fuse for 10 seconds, but it didn't work. Can anyone help????????

[MT-2500]

Originally Posted by 02TB

My 2002 Trailblazer LT blows hot air from the passanger side and rear and Ice cold from the drivers side front. I tried to sync the control modual by removing the HVAC fuse for 10 seconds, but it didn't work. Can anyone help????????

Is it setting any code body codes?

First thing make sure the charge is good.

With compressor jumped and running post back you low and high side readings at idle and at 2K.

With a ac recharging gauge set.
Like one of these.
http://www.ackits.com/merchant.mvc?S...ory_Co de=DIY

Low side should be close to 30 lbs.
If it is dropping under 25 lbs the switch will cycle or shut off compressor.

[02TB]

There are no codes. The A/C blows ice cold from the drivers side. The air out of the pass. side is not hot due to outside temp. It is being heated as if you have the heat on. Someone told me to sync. the relays, or motors(the ones that change the direction and source of the air). Do you know how to do this??

[MT-2500]

Originally Posted by 02TB

There are no codes. The A/C blows ice cold from the drivers side. The air out of the pass. side is not hot due to outside temp. It is being heated as if you have the heat on. Someone told me to sync. the relays, or motors(the ones that change the direction and source of the air). Do you know how to do this??

Removing the fuse should have done it.
Or you can try a battery disconnect.
Body codes and ? Body PCM communication?
Will it put out cold on manual control settings?
How is the R-134a charge? And low and high side pressure?
Some of them had the wrong AC charge on the underhood sticker.
Has it ever been recharged or add to?
MT

[Kemi]

Originally Posted by 02TB

There are no codes. The A/C blows ice cold from the drivers side. The air out of the pass. side is not hot due to outside temp. It is being heated as if you have the heat on. Someone told me to sync. the relays, or motors(the ones that change the direction and source of the air). Do you know how to do this??

If the AC blows cold from the driver side, the refrigerant charge is not your problem.

As far as syncing the actuators that control airflow, it probably won't work. The reason:

You probably have a bad actuator. If this is the case, you will need access to a repair software for airflow diagrams, electrical diagrams, locations, replacement process etc... In my experience, these type of problems, while common, are best left to an automotive technician.

[jpoobear]

I am having the exact problem on my 2002 trailblazer ext. The drivers side blows heat and the passenger side blows ice cold. weird!!
can anyone help?

[maxwedge]

Welcome to AF, I would start a new thread here, this is old, usually this is caused by an actuator problem, but must be checked out as this is a tough job on that truck.