Hi. A few weeks ago I had a problem with my AC. I charged it up with a can of R134 and was fine until last Friday. I lost my AC which is no good at this time of the year in Las Vegas. I checked the pressure by connecting my pressure gauges. Engine idling, temperature on both sides set to Lo, fan at full blast, outside temp this morning was 77. Low pressure side 35 psi, high pressure side 195 psi. Air at passenger side vent cold, driver side not so cold and getting warmer. After a few minutes both vents have warm air and getting hot. At that time pressure on low side jumped to 110 and pressure on high side dropped down to about the same. I took apart the duo valve but it was clean inside and both pistons and O rings in good condition. Voltage on both solenoids was the same, 13V. This means both valves are closed, no hot water going to the heaters. I went through the AC diagnostic and this is what I got on the AC control unit display:
1 - 91
2 - 78
3 - 87
4 - 80
5 - 138
6 - 186
7 - 14
8 - 139
10 - 6
11 - 3
12 - 3.3
20 - 7.8
21 - 42
22 - 00
23 - 32
24 - 13.1
40 - 164
41 - 32

No fault codes present !
Would anyone tell me what is going on with my AC system ? I suspect a bad expansion valve. Thank you.