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.
The Air Conditioner is on
because it was hot in 1921
it simply means you have to add freon to ur air conditioner....you can buy freon at any auto parts store.
The most likely problem is it's out of gas
You are low on coolant to the heater core.
There are three main possible causes to explain why a car air conditioner is blowing hot air. These causes are a worn out compressor, refrigerant leak, and an electrical problem.
Compressor not running?Heater control in heat position?
A.C. circulates air(just like a fan) and turns it cool.
yes, if you drive and keep your windows open
Typically if you are getting hot air you need to recharge your freeon(spelling). It is something that can be done at home, but i strongly encourage professional charging.
it's an air conditioner because you made it into cool