hvac connector pin outs (91 4 wire)
 

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

Re: hvac connector pin outs (91 4 wire)
 

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.

Re: hvac connector pin outs (91 4 wire)
 

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.

Re: hvac connector pin outs (91 4 wire)
 

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.

Re: hvac connector pin outs (91 4 wire)
 

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

Re: hvac connector pin outs (91 4 wire)
 

VIN E (TBI) (coolant fan circuit)


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