The system is low on freon...........
There is a handle that you pull to close the vent that blows hot air into the balloon.
The Air Conditioner is on
Differences in air pressure.
That's usually an indication that the refrigerant level is low.
One thing to do is to check the A/C Relay. Mine wasn't plugged in once and it did that.
There's duct work in or under the dash. Check to see if some of this duct work came apart.
Well the main reason why your car blows out cold then hot is because the air conditioner may not be working properly. You should go to the car shop and get it fixed.
If the ambient (air) temperature rises and the A/C blows warm air, it probably means that you need to add freon.
If the AC is on Vent and it blows hot air in and the temp is at coolest. I think it does not matter because when you have it in vent it is venting air from the out side, it will start blowing air from the out side meaning if its hot out side the air will come out hot. Sometimes a car might blow hot air when you have it on full AC and cooldest. When you accelerate your car hard but it should cool down after you stop accelerating hard.
the system is probably out of coolant.
Two basic reasons:The air conditioner is brokenThe air control doors that switch from hot to air-conditioning are jammed or broken.