I use two relays, the diagram is in my post. It works fine, but it bypasses the compressor cutout. As long as my compressor doesn't seize, no problem.

The reason the Klima isn't working is that the EDS computer, which controls idle speed, EGR, and various RPM sensitive functions, isn't working well. It intermittently fails to produce the correct speed signal, which affects the Klima. Diesel300 posted a few months ago on replacing the capacitors on the EDS circuit board, and I just haven't had the time to do it. I expect that the Klima function will return to normal if the EDS computer is working correctly.

There is no pin four on manual transmission cars.