Ok here's results.

Put the Bosh relay in. At first nothing. Go fool with A/C buttons. Wham ! Compressor kicks in.

Go back and press fan buttons. Auto to low to high. Still o.k. Move temp wheel. Can hear the fan slow down when I roll the temp wheel to white/red zone - seems normal and o.k.

Now, push buttons from A/C to Economy and back. Compressor cuts out. Fool with the buttons, press A/C button in hard a few times. Get compressor going again. Cabin temps drop.

Don't touch buttons, cut engine, put back Klima relay. Compressor still running o.k. and cooling. Not touching buttons anymore.

What do you think ?? Buttons ?? Inconclusive ? Klima relay o.k. ?

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1986 SDL
My Other Car is a Porsche. When it stops leaking, I'm out of oil.