2003 yukon A/C in and out

[RAWVORTEC]

The yukon will blow cold ac more so while we're driving and there's air passing over the engine. The ac is great when it's on, but when sitting or even sometimes while driving it'll go to a humid cool temp. What to check first?

 

[YukonXL04]

I would pressure wash your radiator and AC condenser first... see if that helps