climate control problem Help

[triton1]

My 4 wheel drive stopped working somthing to do with the vacuum I was told to check the climate control and see if it was sticking on defrost? well turns out that I was using my air conditioner and it switched from blowing out the panel vents to blowing from the defrost then a couple seconds later it went back to the panel by itself, does anyone know what my trouble is I am sure this is what is wrong with my 4x4 also!

[sau4u]

Definately be your vaccuum pump. Located under the hood on the passenger side. Very easy to get at and easier to change.