i have 2000 ram 5.9 2wd and have an ac problem.its 100+ degrees here and ac only blows throught defrost and floor when its on max a/c and if i switch to just vents it dont blow through the vents. if any one has suggestions im open cause its hot.

 

Use the search tool at the top and type in "wild vents"
many threads will pop up.
It's a vacuum leak, guaranteed.

 

go to autozone and get a HELP! check valve, its like 5 bucks. out it between your intake and where it Ys out. make sure you have it going the right way. your gonna have to find a way to seal it cause one side of the valve is to small to seal on the hose. i just fixed mine a few days ago....