my 2004 has a digital dual climate control for the a/c, every once in a while only passenger side will blow some cold a/c and the driver side will blow hot air or vise-versa,... its done this about 4x now in the past month....

what can be causing this? maybe i need to change the digital dual climate control unit?

thanks..

 

im not sure but mine usually does it after disconnecting the battery? it has to do with some little door i think....

 

The blend door actuators are known to fail and will cause the symptoms you describe. If you search this section for "actuator" you'll probably find a bunch of info about them, and possibly a pn. I believe that Torque_Wrench has posted some actuator info...

 

hmm... 50% of the time it happens its becuase the battery has been disconnected?

 

I know both silverados i've had will mess up kinda like that. if im driving and turn it to heat a little then if i turn it back to cold it will not go back to cold. i found that turning it off and back on it resets or something and goes to cold( i even do this while on the highway, just let it coast for about 10 seconds)

 

mine does that ever so often. . . . I know that it has something to do with the blending doors, but that's it.

Turning off the truck, and restarting it takes care of it for now.