98 Boxster HVAC troubleshooting

[BRK2LRG]

Help needed! 2 year owner of the 1998 986 base, no real issues then last month the battery dies. Charged via charger, after that left on a tender. 1 week later, no AC. I have gone thru all of the motions, no codes other than 02 sensors to address, fuses check, new relay check (no change), static AC pressure check 120/35 (compressor not running, holds, no leaks present). Separate 12v source to check AC clutch check (pulls in), 12v at low pressure switch - is there another high pressure switch im missing? 12 volts at relay. CCU works as intended- i think, blower works, snowflake etc.. What am i missing?! next step is to remove controls, clean contacts and reinstall. Did i fry something with the battery tender? All help is appreciated!!!

[JFP in PA]

Should be under the windshield cowling where the battery sits.

[BRK2LRG]

17 hours ago, JFP in PA said:

Should be under the windshield cowling where the battery sits.

I found that one, have 12 volts at the connector, is there any readings i should be checking for on the switch itself? i.e. ohms, continuity etc? thx

[JFP in PA]

Both the low and high pressure switches must be in the closed position in order for there to be a complete electrical circuit to engage the compressor clutch.  I would be looking for continuity across the terminals on the switch, which would indicate that closed position.