k10 vacuum feed

[gcochran223]

been posting lately about the heating controls in my truck, hopefully trying to get it figured out soon. the truck is a 1986 k10 with air conditioning. i need to re feed the a/c controls with a vacuum source. when the previous owned the truck they gutted everthing in the engine bay with the hopes of being a mud truck. well i snagged the truck up and want to be able to switch from vent to defrost or however it works. i am by know means a mechanic just trying to get it working so any info is appreciated. do these a/c controls get their vacuum from the vacuum advance on the distributor? i checked the diagrams and that's what it seems. well my buddy that put the motor in for me has a vacuum line going from the distributor to the aftermarket carb. can i tee off that line(the main feed) to the vacuum reservoir and then into the cab? thank you.

[gcochran223]

on the temperature control assembly that is vacuum fed, is it obvious which one is the input for vacuum feed? i have my vacuum routed i just need to connect it too the selector panel. i briefly looked at it and there was a few open ones on the rear but wondered if anyone off hand knew which would be the input or if it even says on the rear.

[bd]

on the temperature control assembly that is vacuum fed, is it obvious which one is the input for vacuum feed? i have my vacuum routed i just need to connect it too the selector panel. i briefly looked at it and there was a few open ones on the rear but wondered if anyone off hand knew which would be the input or if it even says on the rear.

Look at page 1B-41 (Pg 104), figure 42 of the 1986 Service Manual for vacuum reservoir plumbing; and pages 1B-20 (Pg 83), figure 20 and 1B-42 (Pg 105), figure 44 for drawings of the vacuum selector switch.  Often, the vacuum switch ports are individually numbered if you look closely.  Some of the ports may need to be capped.

[gcochran223]

thank you