Rebuilding my A/C system

[robertjhaley]

I have an '86 GMC truck that originally had A/C. Many parts were missing when I bought it. The fan blows but I can't switch between the different vents because the vacuum lines were disconnected when a different motor was installed. Does anyone know where I can find diagrams or information that can assist me in getting the vacuum set back up? I installed a Jegs vacuum reserve canister to assist with the brake booster. The motor has an aggressive cam so I don't get a lot of idle vacuum. Does anyone know how much vacuum it takes to run the A/C duct work?

 

[chengny]

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I think any amount of vacuum will work - the system might just react slower at lower vacuum. Just make sure you tap into the intake manifold under the throttle plates (i.e. an unported connection)

 

[robertjhaley]

Thanks for the info! This is exactly what I needed.