Maybe you diesel guys will have ideas...For my 87 260E.
Here are my static pressures.
Two problems:
1) Compressor is not kicking on by itself. If I bridge the pressure switch -- Nothing. If I bridge pin 5 + 7 on Klima -- Bingo compressor engages.
2) R12 in can is not being sucked in. It has taken just over 1can's worth and it simply won't draw in any more. I've let it run at idle for over 10minutes and the can is still full
I've tried both with the compressor on (after jumping klima) and off. Can is still full.
Any ideas? I'm completely baffled.