Well, today was the day to add my usual two cans or so 134a to the Blazer for summer. I know there's a small leak in the system, but it takes five or six months to get to the point where the A/C is no longer cool and by then, being in New Jersey, I don't need it any more until the next summer. So the problem is that the system won't even take part of the first can because the compressor keeps cycling in and out. Like it engages for about two or three seconds, then disengages for five to ten seconds, and so on and so on... So what's the deal?? Would like to get this fixed ASAP 'cause I might not have the time to work on the truck for a while after today. Thanks! P.S. Was converted from R12 to 134a a number of years ago, so that's not part of the issue.