If it still blows cold when it is at running temp, check the engine thermostat, its probably stuck in the open position.
The heater blower may not be working properly. Without the heater blower working, the air will not come through the vents.
sounds like a vaccum line is off. Do you have an aftermarket stereo? I could also be the switch, but I would bet on a vaccum line, search for a diagram then go from there.
could be that your vent on your dash is open.it will pull outside air in and if you are using the ac the air coming in the vent is from the hot weather outside.........there is a little spinning knob between the vents , make sure it is closed
There is probably a fuel leak somewhere. You should have a professional check it out ASAP. There is a possibility of a fire if left alone.
Find the vacuumline that goes from the intake to the resirvoir and from the resirvoir to the inside of the cab. It isn't connected.
Check the floor heat vent and defrost to see if air comes from them. The vents will be vacuum controlled and a vacuum leak will make the vent doors divert air to the wrong place. Check the entire engine and climate control systems for a vacuum leak.
Heater may be "airbound" and have to be bled
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can you please clarify what you mean, do you mean that the front heater blows cold but the rear blows hot or do you mean that when the heating is on cold it blows hot? many thanks paul
If the dashboard vents in a 1996 Buick Park Avenue aren't blowing air, it could be due to a few common issues. First, check the blower motor and its fuse, as a failure here would prevent air from being pushed through the vents. Additionally, problems with the climate control system, such as a malfunctioning actuator or a blockage in the ductwork, could also be the cause. Lastly, low refrigerant levels or a faulty HVAC control could affect airflow to the dashboard vents.