JUST bought this van little over a month ago. Paid $1000 for it. It has 173+K miles on it. When the engine is in the normal heat range it is blowing out FREEZING cold air! We stay warmer with it off. Problem is I have 3 small kids and no money to buy another vehicle. I have NO idea what could even be wrong. OH- and until recently when the rpms were at least 2+ it would blow hot air but as soon as you idled it was cold again. But now its just cold air all the time. I live in Ohio and it is pretty cold. Winter is just starting and I dont know what to do! PLEASE HELP!!!!