What should I check for since my A/C stopped blowing cold air all of a sudden. It used to blow very cold air and yesterday it just stopped.

 

could be a ton of things..does the compressor turn on? you could of also sprung a leak

 

check to hear if the compressor comes on.

if it does, then check to see how often it comes on and off....... if its real quick like constantly on off then theres no charge in the system and likely got a leak...... you running r12 or r134?