[sagacis]

I've searched the forum and the internet. I've read all the messages. I still need more information, and the local shops haven't been entirely helpful.

Last year, I replaced my Air Conditioner compressor with a Sanden rotary. At the time, I also replaced both of the directly connected hoses with new hoses. I replaced the receiver/dryer and upgraded to 134 (flush, vacuum, etc.) For nearly a year, everything was fine and I had cool (not cold) A/C.

A couple weeks ago, the air wasn't so cool. After playing with the charge level over a couple weeks, and injecting lots of dye (I always used dye-containing freon), I haven't found a leak.

The high/low-side levels are reasonable during charge (and the air gets a little bit cooler, I think), but after a few hours of sitting, the system doesn't cool any more. When I put the manifold on while running, it shows low high-side and low low-side. When off, I was showing too high a pressure, so I brought it back down to normal charge.

So... This could be a number of things. A giant leak like I originally though should be visible with dye, right? I've scoured the system and found nothing.

My current theory is a blockage in the system somewhere. Short of just replacing everything anew, I want to find the actual problem, but I don't know how to find it.

Should I just replace my expansion valve (and receiver/dryer of course) and hope that was the problem?

I'm always thankful for the responses on this board.