My 2005 H2 has cold air Blowing out. The Anti Freeze level is ok, summer time the AC is ok. Any thoughts what it could be or has anyone else had the same problem?

 

Hi, had similar problem in my 04 - its one of the Air Door Actuators (blend door) - I bought off Amazon but depending on which actuator is bad it can be a easy job or a nightmare. Mine was one of the hard ones so I had my mechanic install my actuator and now all is fine.
Do a search on "blend door actuators" or "air door actuators" and you will find which one you need to buy and difficulty in replacing.

 

It could be the heater core. It's good to flush the whole thing. My friend did that for me as anything I touch in the car disintegrates :S

 

Is the truck getting up to temperature? Start with checking the that heat is going in and coming out of your heater hoses.