1986 suburban rear ac dash switch

[88suburbanoverlan]

Hey guys, I have a cross-country trip tomorrow and I can’t seem to find my rear AC switch for the dash and my system is blowing nice and cold in the front but I need the rear AC for my dog. Can anyone tell me if there’s a way to turn it on without the switch by engaging the female portion of the harness that plugs into the switch?

 

[YakkoWarner]

I'm at work right now so I can't look at mine (at home 40 miles away), but looking at the wiring diagram it appears that the 12V key-on power comes into the switch on the brown wire, and if you put the switch in "low" position it connects the 12V to the yellow wire which goes thru a resistor pack and then to the rear blower, and if the switch is in the "high" position it connects the 12V to the orange wire that goes to the motor without the resistor pack in the circuit. So based on the diagram, the solution appears to be jumper the brown to yellow for low, brown to orange for high. If you have a spare headlight bulb or something I'd test it first using the bulb as a current limiter just in case something is different that the drawing.