The surround sound button is not highlighted to use and I was using it why does this happen and having problems with the a/c heater driver side is blowing cold and the passenger is hot and it will go from vents to defrost on own how hard is it to change ourselve to keep from paying 90 an hour for a 100 part for an 08 gmc yukon denali they said it is most likely the a/c heater blend actuator but they will not order the part until they check it

Do you have sunroof in your vehicle?

I had this happen on my 2004 also. I have the climate zone control module that allows for adjustment for driver or passenger temps. I had to cycle between hot and cold on the passenger side and switch it between defrost and feet, then power off everything for a long period of time using the power button on the control, this finally got the solenoid to become unstuck. If that doesn't work then you have to get into the heater/air ducts under passenger side, which is difficult, to manually unstick or replace the locked solenoid.

sounds like heater matrix leaking,

sounds like a broken area on the defrost grid on the window. Check this. Most auto parts places sell repair kits for these repairs.

our 03 f250 has the same problem on a rear passenger side door. does it make a funny buzzing sound when you press the button?

The plastic piece surrounding the radio has four screws holding it. Two just above the controls for heater/fan, one when you open the glovebox, and one in the same position as the glovebox one on the other side (drivers side). Sorry, but it's a bit hard to explain in words. You'll need to crouch down and look up for the screws, they're out of sight, mounted in the bottom parts of the plastic. After the four screws are removed, use a flat screwdriver in the two vents above the radio to pry them down away from the dashboard, and the whole piece will lift out. Oh, just remember to take the knobs off the radio if it's stock, and the knobs off the heater controls before you start, or they'll be flying across the car when you pull the plastic surrounding out.

The body control module in this vehicle sees a short in the seat heater system. These vehiucles are typical of the heater wiring shorting out. When you try to use the bad heater the computer shuts off all the heaters.

You will need to install a new seat heater pad.

Sounds like the Heater exchange valve. I had the same problem the heater on the passenger side worked but the drivers side was not getting warm...A useful web site for you to try and get a new part is british car parts.co.uk

I just spent my whole day with the same problem and it looks as if alot of other people have too. You need to replace the control valve. Take your glove box out, then take your center console peice out. Then you have to take the passenger side plastic off. This is the peice that surrounds the glove box. Once you have done this if you look underneath the dash towards the center console you will see a little box with an arm on it that goes down to an aluminium hose. That little box with the arm is the control valve.

this is a common problem if you use the seat heater alot.one or both of the seat heater elements will have burned up or broken.where i live it is very cold most of the time and i have replaced hundreds of the seat heater elements.it is rare for it not to be one or both of the elements.