a/c blows warm now.compressor not kicking in> could it be the evaporater temp

COULD BE MANY THINGS, PRESSURE SWITCH,CLUTCH ASSM OR SEVERAL OTHER ISSUES.REC GETTING IT CK'D B4 WASTING TIME AND MONEY

That is the most common reason, yes, but that isn't always the case. Almost every part of the a/c system on my car has had to be replaced in the 113,000 miles it's been driving, so it is a wild card. I would bet on the evaporator temp sensor though.