This 2004 Chevrolet Trailblazer came in with the air flow stuck coming out of the defroster. I have already done a post on how to replace the faulty mode actuator, but I did not have a good enough picture to identify all of the actuators on the driver’s side of the dash. To see that post please click here. The view below shows the three actuators and is taken from the perspective of the driver’s feet, looking above the accelerator pedal and towards the center of the dash.
If you click on the picture it will enlarge to show more detail. This layout generally applies to 2003, 2004, 2005 2006, 2007, 2008 and 2009 Chevrolet Trailblazer and GMC Envoy. It also applies to Buick Rainier, Isuzu Ascender, Oldsmobile Bravada, Saab 9-7X and Chevy SSR. This second group of vehicles, of course did not exist, during all years between 2003-2009.
Once the mode actuator is removed and the new one is ready to be installed, you will need to locate the indexing pin as shown in the picture below. That pin slides into the notch on the white gear on the actuator.
I slide the new actuator into place with the notch and pin aligned and then rotate the actuator slightly to align the mounting holes.
The actuator on the right is the new actuator and the indexing slot is clearly marked. Please click on the picture to enlarge for a better view. The picture also shows the over traveled (stuck) position of the old actuator.
If you would like to purchase the Mode Valve Actuator (part # 15-73596), you can do so by clicking here.
My 2006 envoy had a battery replaced yesterday and now doesn’t blow out the dash vents. Do I need both an actuator and a recal or can I try a recal alone?
Remove the actuator and manually move the door shafts to make sure that the actual doors are not broken. Confirm that you have replaced the actuator with the white plastic gear attached. Also be sure that it is properly aligned. There is a peg that has to line up with a slot in the white gear. If it is not lined up it may be jammed.
Sparky,
I have the vents not blowing on my 2004 Chevy Trailblazer EXT. I went under driverside and replaced the actuator, and did the recalibration. Still didn’t work. Any sugesstions? Thinking the new one was defective… I unscrewed it left it hanning and seen it recalibrate with it moving up and down. I then tried every option on the selection setting. Seems that it’s supposed to either up (vents) or down (legs) but the actuator did not move at all. So if the actuator is not moving at all, would you know where the problem would be??
Ed S – NY
Sorry, I do not.
Do you have a blog describing how to take the accelerator pedal out. I had just about decided that was what I had to do as well. It does have adjustable pedals. Thanks!