Question about Hummer H2
There are some possibilities that you will have to get checked.
1. HVAC Control Module needs recalibration.
2. Control Head needs replacing.
3. Refrigerant System leak. 4) The blower door actuator. the blower door actuator. The HVAC system under the passengers dash, to access it remove the cover below the glove compartment, 2 screws. The drivers blower door actuator motor is closest to the transmission tunnel and is held in place with 2 screws. The Passenger blower door actuator is directly above it on the TOP of the housing. Remove the glove compartment and you can get to it on the top of the HVAC system. Reach up and unplug it and plug it back in first. if it does not correct it you will need to replace it. It is not an easy job since most of the dash must be removed. Start by removing all the decorative allen bolts accross the dash. The center section can be pulled forward an inch or so. This will allow you to remove the trim around the speedometer cluster and drivers a/c vent. The passengers side is a little tricky. You need to remove the side panel that rests up against the door panel. Shine a light in at the upper left corner and you will see a white button aprox 1/8" wide and 1/2" tall this needs to be pushed in with a flat blad screwdriver while gently pulling out on the passenger grab bar(above the airbag). The second white button can be reached throught the far left glove compartment opening. I reached up and pushed in on the white button on this side while pulling out on the handle. This will allow the handle to be removed and the trim peices following. You can now see the screws that hold the upper dash cover there are aprox 3 screws on the driver and passenger side. You also have 2 in the center behind the center trim piece pull forward an inch or so and a 1/4" drive socket will get to the screws here. It then just pulls straight forward NOT UP. and don't forget to unplug the sun sensor on the dash.
Remove the clip holding the duct work you will now see is connected to the backside of the dash passengers side. You can secure it from the outside when reassembling. The acctuator can be seen and replaced. It is still tight but I did not have to take it to the dealer. You have 3 actuators on the H2 that is Drivers side, Passenges side, and recirculate. I would suggest whil you are under the dash remove the blower motor (3 screws and clean out the fan shoot some compressed air in to get any other dust out.). if in your ac system you are using dual control system then, The heater control valve has failed and is open allowing the passenger side heater core to stay hot. It is a very common problem and expensive to repair. It tends to be an intermittent problem and sometimes will work properly. The heater control valve needs to be checked. Dual Climate Control Valve (DCCV) is failed.
If the heater valve is checked ok then the other possibilities which can make this problem occur are.
the blend door and the blend door actuator.Either the blend door is got craked or getting blocked or the actuator is got broken.
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Posted on Jul 17, 2010
Your A/C system is low on R134a refrigerant. You can find a refill kit, It comes with instruccions, at your favorite auto parts store, or you can take your vehicle to an A/C shop.
Posted on Jul 15, 2010
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Posted on Jan 02, 2017
SOURCE: a/c blows hot air on drivers sde
The actuator door on the driver's side is out of position and needs to be reset. Remove the negative battery cable for 1/2 hour to reset the computer. Start the HVAC system and you should be able to hear the door adjusting itself and cold should come out of the driver's side vent.
Posted on Jan 27, 2010
you need to change drivers side temp door actuator then disconnect battery for 5 seconds and reconnect after changing the part, turn key on for 60 seconds with touching heater control to allow actuator to program and then it will work.
Posted on Sep 19, 2009
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