It will until the coolant warms up.
Get the air out of your heater core.
Yes, air flows from hot to cold.
Your heater will blow cold air only.
possible clogged or damaged heater core
THE CAUSE for this is that when your cold air is on the petrol is used to create air. and that is how cars create cold air
The air flows into an electric heater through vents or openings located on the front or sides of the device. Inside the heater, the air is then warmed by heating elements before being circulated back out into the room.
I assume your car heater is blowing cold air, when the heater is on. It seems that, you have air on your coolant. that air pockets blocks the cooland to travel through your heater. it may be a sign of a bigger problem such as blown head gasket in the old cars, such acura legend
The most common reason the heater is blows cold air on a 1999 Ford Winstar is a bad thermostat or blocked heater core.
The heater may blow cold air instead of warm air due to issues such as low coolant levels, a malfunctioning thermostat, a clogged heater core, or a faulty blend door. These problems can prevent the heater from properly warming the air before it is blown into the car.
Air flows into a convector heater through vents or grilles located near the bottom of the unit. This air is then heated by the heating element inside the convector heater before being released back into the room.
It doesn't really blow it out it just warms the cold air.
I would change the thermostat first. If that dont work change water pump