I was just curious if anyone else has had this problem. I've got a 03 4x4 v-6 and I can only get the heater to get hot when the engine is above 2k rpms. My first feeling is that it's the themastat. I'll probably start there. Just hoping someone else had the same problem. Well not hoping...but had....hehe.

Zero

Check your coolant and check your radiator.
I have the same problem. I have no heat when Idling or driving slow. Once I go out on highway, i start getting heat, when I slow down I lose it again.
I noticed that I had low coolant, I filled it up, and noticed that rad is leaking.

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Will do. I had my rad cap leave the other day and I had thought I'd replaced all the fluid. Guess I need to check it again.

Zero