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Climate Control Gonecrazy

bobjshannon

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bobjshannon New Member

bobjshannon

Posted
Posted

I am a Newbie - hi, I posted this incorrectly in the HD-truck forum and got no reply, so I am now moving my questions to this forum ...

 

I have a 2007 Suburban 4x4 5.3L, with 3 zone auto a/c.

 

My HVAC blasts full hot on passenger side when a/c is blowing cold on Drivers side.

New TSB (Sep. 2008), according to dealership, shows this as a programming problem. Dealership is working with GM Engineering to get HVAC reprogrammed. Anyone else had this solution?

 

I tried to find the TSB on alldatadiy.com, but it did not show. Anyone have a suggestion where to find this TSB?

p.s. it is not an actuator, or stuck motor.

 

Any one had the same problem? Thanks ....

Bobj

DofD Senior Enthusiast

DofD

Posted
Posted

Hi there Bob and welcome to GM Trucks! :thumbs:

 

The HD forum isn't as busy as this forum, also if no one had a similar problem they may have not replied.

 

That is one weird problem with the HVAC. I hope that your dealer will get the solution worked out for you soon.

 

I haven't read of anyone having that issue here though.

CapitalTruck Senior Enthusiast

CapitalTruck

Posted
Posted

I could be wrong, but I think the "brain" of the HVAC system is in the head unit itself (the control panel). You're sure it's not an actuator?

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted
I could be wrong, but I think the "brain" of the HVAC system is in the head unit itself (the control panel). You're sure it's not an actuator?

 

The actuator changes the flow of air to either the base of the windshield, the dash vents or the floor vents. The HVAC control does house the 'brain' of the system. If you having problems with the direction of air, then it is the actuator. if it is temp issues, it more than likely is the brain unless one of the sensors is busted

Starrman Enthusiast

Starrman

Posted
Posted

Is there more info on here about fixing actuator problems? I don't have automatic zoned climate control, but just noticed today that the airflow is only coming out the dash vents and doesn't change with the knob....I can't get it to go to floor or defrost or combination of either.

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted
Is there more info on here about fixing actuator problems? I don't have automatic zoned climate control, but just noticed today that the airflow is only coming out the dash vents and doesn't change with the knob....I can't get it to go to floor or defrost or combination of either.

 

 

yeah I would have to look for it, but I know that the actuator gets stuck or breaks

Starrman Enthusiast

Starrman

Posted
Posted

that'd be great. Do you know if the linkage is accessible from under the dash or do I have to remove the radio and climate controls? Its raining here otherwise I'd be out looking at it

CapitalTruck Senior Enthusiast

CapitalTruck

Posted
Posted

Actuators also control the blend doors for the driver and passenger (if dual zone). You know, the little door that selects between outside/evaporator passed air or all of that plus a pass over the heater core. I had the one that controls the temperature of the air on the drivers side go out on me. A lot of clicking noises, sporadic non-reponsive temperature control.

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