My 1999 Astro ac works great in the morning but after it gets hot outside it blows warm air , the compressor doesn't kick on and it's got freon

Could be low on refrigerant, the fan isn't working, the condenser is clogged or dirty. Start by making sure the fan works and the condenser isn't fully of leaves and dirt. If so you can clean it out with some degreaser and a water hose spraying from the inside out. Alex