Is it leaking coolant? If so, chances are the heater core is bad. Let me know if it is coolant.
Also, as far as the vents, check to see if there are any vacuum leaks under the dash and the hood. The vent doors are actuated by vacuum. If there is a leak, it won't properly direct the air flow.
NOTE: I have seen broken hoses, dry rotted ones, and under the hood, I have seen ones that collapse when in use. Check for any of those.
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Wednesday, June 2nd, 2010 AT 8:17 AM