This 2004 Chevrolet Silverado came in with a faulty passenger side blend door actuator. In the last post I got you to this point. If you have not yet read that post please click here. Now that the dash cover is off and you can see the actuator, but you still cannot get to it. More things need to come apart.
Remove the wiring hold down clips from the metal brackets as shown below.
Remove the 7 mm headed screws from the brackets on the passenger side.
Using a ratchet remove the two 10 mm headed screws from the front edges of the bracket on the passenger side.
Remove the 7mm screw from the driver’s side of the cross over bracket. Remove the bracket.
Now the “U” shaped bracket on the passenger side can be removed.
Remove the 7 mm screws on the driver’s side bracket. I also remove the two 10 mm bolts on the driver’s side bracket to make sure the dash will move around freely.
Disable the air bag or SRS system according to the manufacturers directions. Then remove the two upper 10 mm bolts from the air bag as shown in the next two pictures.
Then remove the two lower air bag screws.
Note that the air bag screws are shorter than the bracket screws. Do Not put the long bolts back in the airbag when reassembling.
< Pull the orange "positive assurance clip" from the yellow connector. Disconnect the connector and remove the airbag. Use the manufacturers recommendations for handling and storing the airbag.
Getting close but more still has to come out. The silver box shown below is the vehicle communication interface module. It may not be present on all vehicles as it is related to the Onstar System.
There are three 10 mm nuts that hold the module to the brackets. They are locking nuts so they have to be wrenched all of the way off.
Remove the two 10 mm nuts at the passenger end of the dash carrier. Do Not mix these nuts up with the ones removed from the VCIM brackets.
Now remove the 7 mm screw from the backside of the right passenger vent.
Remove the 7 mm screw from the position shown below.
Wiggle the corner of the dash out as shown below.
I used a screwdriver handle to keep the duct work lifted.
I also used a pry bar to lift the duct work slightly to give myself more room. The weight of the pry bar is enough to keep the duct work up but you may want someone to hold it for you. If someone hold it for you be sure they do not use the area in the center of the opening for a fulcrum. It will break the mounting panel where the nut is for the phillips headed screw that was removed much earlier.
The VCIM can now be wiggled up and the wires disconnected.
Remove the wiring harness retaining clip from the bracket as shown below.
Remove the wiring harness clip from the cross bar as shown in the two pictures below. Lift the harness slightly to gain more room to work.
Using a short 5.5 mm socket and ratchet, remove the two mounting screws. Disconnect the wiring from the actuator before removing the screws. makes it a little easier.
You will actually need to work through two openings and use both hands to make it easier.
A magnet on a stick works real well fro retrieving dropped screws and sockets.
You can finally remove the actuator from the dash.
Free at last.
The new and old actuators. The numbers match 52402588.
If you need to buy one of these actuators please click here.
If you do not have a Tech 2 or similar scan tool to diagnose these actuators, you can do voltmeter testing at these connectors. That is a whole other post though.
I have included the address for the most relevant repair article for your problem. To see more please use the “Sparky’s Repair Articles Menu” tab to access my new menu. There you will find “GM Full Sized Trucks & SUV’s”. Drill down to “HVAC Front” & etc. You will either need to allow popups from this site or you may have to click on the link several times for it to open up.
http://www.sparkys-answers.com/2008/07/2005-chevrolet-silverado-blower-inop.html
Sparky–have a 04 2500hd xcab with multiple issues. First, AC does not blow out of any vents. System is charged but won’t blow cold air. Manual temp controls. Drivers side temp control is fine during winter with cold/warm temp differential. Passenger side blows hot only….all the time; summer and winter.
Pretty sure I need the passenger actuator; what is solution for getting AC to blow? Guessing main door actuator maybe? Can you post the threads and part #’s for me?
Very nice and informative; keep up the good work!
I reviewed our conversations and think that the connectors at the right side of the dash may be your problem. I would start by wiggling the connectors within 30 to 60 seconds of key on and see if the doors react to the wiggling. If they do, remove the connector and do a careful visual inspection of the terminals on both halves of the suspect connector. If there is no reaction, I would recommend testing the circuits at the harness connector related to the passenger side actuator.
Well sadly, 11 days later the problem has returned. I changed the passenger actuator and for the hell of it changed the fresh air/ recirc while i was in there. Problem resurfaced. So, I took the actuator that had came of the recirc/fresh air door, replaced the drivers side actuator with it cause i didnt think that actautor was bad (the recirc/fresh one). same thing. Could the mode door actuator be causing all of this? A GM tech said that the blower motor resistor might cause this sending crazy voltages to other parts of the HVAC system. Hadnt heard that one before…. Im at a loss now.
One more thing i forgot to mention, I have to wonder now though if the actuator was really bad, or i just needed to unplug and plug back in a couple of connections….. and that was the problem all along..Guess ill never know… Have new ones in there now. Was damn good practice anyway!!