Well, the compressor works. I jumped the switch and the clutch engages. I then put the wire leads back on the switch and the clutch also engages. There is about a 10 second delay between starting the car and engaging the compressor switch.

So the compressor works. That means the system has enough refringent pressure, all fuses and relays are OK, and the push button penal works as well, right? But it does not blow cold air. The search for a solution continues.