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The photo's that you showed are of the receiver/dryer.
If you take off its electrical connector and short its plug ends together, and then flip the switch, the compressor should come to life. Don't run it long in this configuration as you do not know the state of your system and you could be low on oil and/or R12. Lack of oil in the system in this configuration will burn up your compressor!
If it still doesn't come on, then the relay behind the center console, on the passenger side needs to be looked at.
This relay is attached to the snowflake switch and is a delayed relay, meaning it takes about 5 to 10 seconds for the compressor to come on once the switch is thrown. You should also hear a audible click when it comes on and the main fan in the cabin will start up as well whether you have the fan on or not.
If you do not hear an audible click, then check the fuse panel to: a) make sure the fuse is good and making good contact, and b) that the physical wire is hooked up to the fuse panel itself. I had this problem on my 90' that I just bought. It drove me nuts until I had the driver side left kick panel off and found that the physical wire had been disconnected! Ugh! What a PIA that was!
Let us know what you find out.
Regards,
Matt
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