ac problem.

my grandpa brought his truck by my house and his trucks ac is not blowing cold. he just had the ac flushed, new ac compressor, new dryer, leak tested, and recharged and it just stopped blowing cold and the compressor wont kick off. he replaced the high or low presure switch. they where out of the other one. could the other one be a causing this problem. it is a 1994 chevy s10

Need more information. I know you put a lot in your post but to know what's going on without the truck, more information is needed.

You need the pressure on the high and the low side to diagnose.