SOURCE: 2000 pontiac montana heat issues
Try checking the cabin air filter, if equiped. It may be clogged making it draw more cold fresh air. Check your owner's manual to see if you have one or not, and it's location.
SOURCE: heater blowing cold air
squeeze the hoses to get any air bubbles out and refill coolant as necesary. are you sure you put thermostat in the right way? may be backwards. also may be your sensor.
SOURCE: air condition not blowing cold air
Is any air coming out at all?
If warm air is being blown out, then your refrigerant level is probably low. The car is fitted with a safety cut off, to stop the air conditioning system working if the refrigerant (R134a) level is low.
This cut off only effects the air conditioning, the blower would still function normally.
SOURCE: Fresh Air Intake - Chevy Venture
Sounds like you need to do a A/C deodorizing kit. May be able to find one at your local parts store. Or, run your A/C without your recirc, and hope the mildew gets off the EVAP core. It is possible you have a dead mouse in your heater box if it smells really bad.
SOURCE: heater blows cold air have replaced the thermostat
sounds like the controller went bad use temp checker see what your temp is at inlet of heater core from hose
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