1979 FJ40 Wiring Harness - Mystery to me (1 Viewer)

[1979 FJ40ish]

Can some tell me what the socket on the right side of the engine compartment near the blower motor is for?

See the pictures:

Thanks!

 

[KFJ45]

Not sure. Check out @Coolerman here on MUD. He's the go to guy when it comes to the electrical stuff!

 

[Bear]

Pressure switch boot for A/C equipped trucks?