Hole in firewall

[bigge31566]

I have a 82 C10 and the hole in firewall that the wire connectors for the ac control module there is a vacuum hose going from the side thru the firewall that has been cut. Do anyone know where this leads snd also there a brown wire that from the engine department thru firewall under the dash any idea where it goes it is a blade connection

 

[bucket]

Got a picture of brown wire. The vacuum hose sounds like it's for the HVAC controls. Do your defog/vent/heat modes all work?

 

[bigge31566]

I'll take a pic tomorrow but runs with the wires going to the ac controller

 

[bigge31566]

here is pic of brown wire and connectors to ac control unit

 

[bigge31566]

try again, wire in upper left hand, others plug in ac controller

 

[HotRodPC]

Did you ever figure out what the brown wire was for? I'd certainly be thinking it's related to the AC.

 

[MadOgre]

try again, wire in upper left hand, others plug in ac controller

That brown wire looks like it is for a tach. If the vacuum hose was near the top of firewall just off to the passenger side? Then it is for the climate controls on the dash. If it is on the drivers side by the steering column then it is for the cruise control.