Why is hot air blowing from vents n it not on n when itson? Also my 4x4 ddoesnt come on without manully locking hubs.

What is your question?

A/c blew cold when i got it 6 mths ago but not very hard also i run out of coolant n have no leaks 2006 ford f250 king ranch super duty

What makes this problem better or worse?

Nothing

How long has your 2006 Ford F-250 Super Duty had this problem?

2 months