Any one have pinouts for a 91 4 pin hvac connector (engine bay)?

Pin color function

a- lt blue
b- red- battery-on fuse able link
c- green white strip
d- black-ground

 

I just looked in my 92 manual. The Light Blue goes from the Pressure Cycling Switch to the A/C High Pressure Switch. I haven't seen anything about the Green/White, though. Ima keep looking, however.

 

Found it. Dark Green/White goes from the coil of the coolant fan relay to the A/C Control Head (the thing in the car where you choose Max, Vent, etc).

The whole circuit is: Fan Fuse, Coolant Fan Relay, A/C Control Head. When you choose Max, Norm or Bi-Level, it completes the circuit to ground and causes the Fan Relay to switch on, and therefore turn on the fan.

 

Thank you Sir. It is interesting to note that the factory schematics never show the green/white wire on the connector. It looks as if the connector is labeled as C105.

 

Yea. It is C105. I found the green/white wire in the Coolant Fan schematics.

 

VIN E (TBI) (coolant fan circuit)


http://www.austinthirdgen.org/mkport...an_V8_vinE.jpg