Originally Posted by ingydrummer

I dont see why you need to disconnect the battery. I dont think I did when replacing mine and everything came out fine. Did anyone have a problem when not disconnecting the battery before the replacement of any actuators?

Originally Posted by TBarrow

I posted this on some other sites and just joined here and wanted to let you know some more details on the Blend Door Actuators. I bought my part through XL Parts and it was around $8x.xx I will look up the number and it is a ACDelco.

It is 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. I removed the clip holding the duct work you will now see is connected to the backside of the dash passengers side. I resecured it from the outside when reassembling. The acctuator can be gotten to and replaced. It is still tight but I did not have to take it to the dealer. The part from the dealer is 237.xx check with gmpartsdirect.com for pricing shipped to you. You have 3 actuators on the H2 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.)I just did this to mine today.

I know it would be better with pictures but I forgot to take them. email me if you need any clarification. mtoddbarrow@gmail.com