Did you have a leak? I will try it today but I doubt that is my problem since when the compressor was engaged, the air was cold.
You probably knew this was coming, and I have an idea, but to avoid "Grounding that circuit will burn a circuit board in the PBC." how would I ground the the Klima signal at the low pressure switch? Would the grounding then engaged the compressor?
Would the temperature sensor inside the cabin prevent the compressor from engaging? Actually, I think the "sucking" fan behind the glove compartment does not work, or it is malfunctioning.