I have a 2004 GMC Sierra 6.6 liter diesel looking for body control modular I think it's under the dash driver side not for sure though and do you have to take the dash out to replace it

SOURCE: The air conditioner on the

its the actuators,take to shop tell them to replace.

Gary Queen

• 85 Answers
• Posted on Nov 12, 2008

SOURCE: How to replace side mirror on 1996 GMC Sierra?

See Figure 2
Fig. 2: Outside mirror-below eyeline type

1. Remove the mirror cover screw and lift the cover and pivot the mirror towards the window.
2. Remove the mirror to door bolts and remove the mirror and seal from the door.
3. To install, position the mirror and seal to the door and install the retaining bolts.
4. Pivot the mirror away from the window, and lower the mirror cover.
5. Installation is the reverse of removal.

SOURCE: how to replace a water pump on a 5.3 liter sierra

I suggest that you visit the autozone.com website and register the vehicle. It doesn't cost anything and will give you access to an online repair manual. The steps for replacing the water pump should be available there. Hope this helped and best wishes.

SOURCE: 2004 gmc 1500 sierra heater control stuck on

Defrost is the default position. Is the control a autyomatic temperture control unit? ( you set the temp and select automatic) if it is the system is completely electronic. You push the buttons and the control still says defrost or can you select something else and the control shows it but it just keeps coming out the defrost? If the control changes and the air comes out the defrost anyway and the cheack engine light isn't on, then the problem can be blown fuses or an air door actoater not working. Does the dash emit a clicking sound? if it does with the covers off the bottom of the dash reach around touching the different pieces till you touch the idem that is clicking. this is an acutor motor, or blend door motor. they have gears in them that wear out and break the motors aren't repairable and you just replace the ofending motor. the door that is moves can be stuck. and may have to be freed up with blaster, WD40, or other rust buster till it moves easy. maybe after getting the door to move smoothly you can get the old motor to move the door wiithout having to install a new one.

SOURCE: My 2004 GMC sierra blows hot air out the drivers

If you've replaced the actuators and they are working.
One of the blend doors may be broken inside the heater box. To repair or replace the broken door you
have to remove the heater box. This is not a small job. The book gives 6-7 hours for the job. There is a
cheat that I've heard good things about. I guess it can
be done in a fraction of the time. You can find out
about it at heatertreater.net I have not used it myself
but I know somone who has. And it worked well for
him. Hope this helps.