Always suspect the high side service valve. For some reason the
"standard" quick-connect valves are anything but on the high side, and
I've resorted to getting adjustable depth connectors on my hose set.
It's very very easy to damage the Schroeder valve in the high side
fitting if the hose set plunger is too long, and every conversion
fitting I've seen (along with factory ones) is a different operating
depth. I've wrecked a few myself.
That said, you need to check all the high side (read hot) o-rings and
lines, the one between the condenser and receiver/dryer is prone to
failure, there are four 0-rings on the receiver/drying and the ones on
the expansion valve tend to fail as well.
UV dye is a great tool.
Peter
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