Hi im Ben. I own a 01 dodge ram 1500 5.9 magnum. I purchased the truck about nine months ago. On the drive home i found out the cruise control didnt work and the a/c or heat is stuck on defrost. That says vacuum to me. Well with this last snow we had i found out my four wheel drive isnt workin. Transfer case is fine, hubs arent locking Again i think vacuum. I cant find any bad lines. PLEASE HELP!