2000 jimmy ac blowing hot air all the time



I don't know how to shut the vents that bring in the outside air so it blows hot air all the time even when school is off


I had a similar problem there is a manufacturer defect regarding the AC unit but also what I do is set the switches to cold air and off or set it to cold air and on the defogger setting. Before starting the car pump the brake until you can’t anymore this should seal the vacuum. If you use hot air and then want it to stop perpetually blowing hot air you have to turn off the car all over again and pump the brakes hope that helps.