A/C Not Blowing Cold

It's hard to say how much to put in if you don't know how much is in the system. I'm not a fan of a "quick seal" addition unless you know it is a very small leak. There are so many things that need to be checked to make sure the system is operating properly that it may be best to take it to an A/C shop and have them check it out.

had similar problem. added a can of leak detector. if vehicle has rear air, check feed lines beneath vehicle feeding rear unit for leak. that's where mine was.