Comfort controls not working.

[Sinac]

I havn't had time to look at it, I wanted some input before I do. Today I noticed that no matter what setting the comfort control is on, only the defrost will work. Are they controlled by vacuum lines?
Thanks!

[sikktruk01]

yes the climate unit controls the dampner motors with vacuum. the default setting is defrost when the vacuum supply is lost. I know the vacuum motor is under the hood on the passenger side, but I've never been inside the dash, should be fairly easy to diagnose the problem. someone with previous experience will hopefully chime in and give you some helpful pointers.

[slammedSI]

Is it 4wd? If it is does it work?

[Sinac]

Well I had the dash off last weekend and was thinking possibly I knocked off a hose somehow. Hopefully it was something as simple as that.

[Sinac]

No, my 4wd has not worked since I bought the truck. But this started sometime this week. I have not driven it since Monday when I had my dash apart.