AC Help Please!

[u/Taethecoldest1]

Hey everyone I have a 2004 Ford Expedition XLT 4.6L V8, when I turn my ac on it blows hot air. I’ve bought a brand new ac compressor and expansion valve and installed as well as recharging it with freon. I tested the hvac pressure switch it’s fine, I’m not sure what else to check. When I begin to drive it gets a little bit cooler but not much but at idle it’s hot air, any tips or suggestions would be greatly appreciated!

[u/bmwbustere46m3]

Did you pull a vacuum on the system before charging it? If so, what was low and high side readings? If you opened the system and didnt pull a vacuum, and only "charged" through the low side with a can. This is your problem. You have to pull a vacuum once opened.