2003 Silverado 2500hd Hvac Vent Mode Not Working

[jerrydaz]

Hello all,

I have a 2003 Silverado 2500HD Crew Cab and just noticed that the vent mode doesn't work. I picked up the truck in Summer and only used the A/C but now that it's getting colder I noticed the defrost and feet didn't work. It has the Dual Automatic Climate Control System and usually I just hit Auto and let it do it's thing but when I tried to override it to clear up a foggy windshield I notice nothing happened. Aside from that it works great.

 

Anyone have any ideas?

 

Thanks in advance!

 

Jerry

[tenntoby]

Could be a mode door actuator.Seen a lot of them fail.

[jerrydaz]

Could be a mode door actuator.Seen a lot of them fail.

 

Thanks! Is this a dealer thing or could a mere human tackle it?

 

Jerry

[[email protected]]

IF THAT is what it turns out to be then you can do it if you are really familiar with taking apart the dash and whatnot and can take an entire day doing it right, other wise take it to a dealer. This is only if that is infact what your problem is, but me, I think it's kinda funny that all the mode actuators would fail at the same time.

[tenntoby]

2001Silverado364 is right ,IF that is the failure. Any shop with a scanner capable of monitoring HVAC data could diagnose this. Check for HVAC door motor counts going crazy when commanding a temperture or mode change(your case a mode door change.)Not too bad to get to, behind the glovebox compartment, mounted with 7/32 screws.HTH.