ok so i have an 87 honda accord and the air used to work great... over winter
the o rings deteriorated and the freon leaked out ... so thinking that i just needed a charge i retrofitted it to r-134a and it worked excellent for a day then once again leaked out... i changed the orings and now a week later its still holding a charge very well yet it doesnt cool and the compressor does kick on what could be the problem

 

could be anything. did u over fill it? that can cause no or decreased cooling. www.3geez.com

 

if you don't know how to use or have a set of gauges get some because they tell all about the a/c system most likely the freon leaked out again if you have a keihen compressor the one that has 4 squares with 4 bolts on each one you have a very good chance the compressor is toast. remember low freon will cause it to not cool and too much will cause the same problem and can damage the compressor! usally conversions uses less R134a then the R12 because it runs at higher pressure. so hook up the gauges and look at the readings if the low side is in the negitive the expansion valve is bad if it's even then the compressor is bad.