Sadly, everything re the A/C isa "refer to certified tech., etc etc etc".
I can tell ya the hexhead "thing" is a pressure relief and drainage valve.
Re the wiper motor~~~~~~~~~
1] U have a light green/black wire running from the circuit breaker #24 [hot acces. or run condition] two-waying off the wiper switch and the wiper module.
2] From the switch to the motor itself, two wires, one is white/black, the other is blue/yellow
3] the other four wires, pink/black, tan/red, brown/orange, and black only [ground], shoot to the wiper module.
While I do not know which is which of the 4 wires in 3], one is low/speed, one is hi speed, and the other I believe triggers the washer pump.
Thusly, as I read the diagram, hit the terminals on the motor that correspond to #2 above.