HillbillyJeeper

I'm having an A/C issue. kinda same issue with 2 cars. My 92 i just tried a conversion on it. I know its not the best way, but it was $40 for the kit with 30oz of r134, hose with gauge, and fitting ans oil premix with the 134. i got an extra can, as well. so $55, i figured, was worth a try better than $250 at the shop. Followed the directions in the tech article, but didnt replace any parts. Problem is this. I got it charged using the gauge that came with it. Took it for a drive, the A/C worked great. Came back, parked or for a few hours, when back to check, make sure it hadent like lost all the refridgerent right away. To my surprize, the pressures had like trippled. Way in the red, the compressor would run, pull it down a bit, then cycle off. SO i bled some pressure off, got it back in the blue, and it was working nice again. Came back a hour later, same thing. Pressure was way up. Compressor cycling on and off. Si left it at that. Had a similar issue last week at work. A 2001 Cherokee. The comprressor was cycling. we had a can of recharge stuff, added it untill i was in the blue, but barley. But it was working. As the day went by, the pressure kept going up. To the point it was blowing like a relief valve on the back of the compressor. That time i though maybe it was because i charged it first thing, when it was 50 out. and it got hotter throughout the day. but my car,its only been cooling off since i did it. Sorry this is long. Like to make sure all the details are out there. And help or ideas would be great.

Gymbeau

I haven't read the tech article you mention. It sounds like there is air or R-12 still in the system. Did you pull a vacuum on the system before you charged it?

In the ideal refrigerant system, there will be only refrigerant in the system. We are forced to deal with the oil to make the compressor survive. Anything else in the system is contamination and makes the refrigeration performance degrade.

Those kits leave the old oil still in the system. That is taking up space that is needed for the refrigerant. Air in the system is not condensible and it makes the pressure on the high side very high. If the refrigerant you used has a stop leak in it, it is possible that the orifice tube is now clogged and that will also cause excessive high side pressure.

You might also do some light reading here... Automotive AC Information Forum - ACKITS.COM I am learning a lot there.