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Old 06-13-2018, 10:30 AM   #1
70GMCer
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AC & Heat Vacuum Source?

The PO disconnected the vacuum hoses from the engine that controls the heat/ac controls on my 83 w/305 engine.

I'm thinking that I need a vacuum port connector on the intake manifold at that plug near the rear of the intake next to the carb. Is this correct?

Anyone have a picture of that vacuum port connector or part number?

Then, that vacuum connector hose would connect to the vacuum canister that is on the firewall next the heater/AC housing. Is that correct?

I've already checked all of the actuators with a vacuum brake bleeder on the inside for operation & there doesn't seem to be any leaks.

Just trying to get all the parts needed to reconnect the heat/ac controls.
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Old 06-13-2018, 03:23 PM   #2
Dead Parrot
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Re: AC & Heat Vacuum Source?

Yes on the climate control vacuum canister hose connecting to a manifold port behind the carb. There should also be a smaller hose from the canister that runs inside the cab to the climate controls.
No on a picture of the port connector. There are many variations. I would get one that has at least one extra port then you think you need to avoid either replacing it or adding a T fitting. The TH-350 vacuum shift modulator connects to the same spot. Just cap the extra port until it is needed.
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Old 06-13-2018, 03:35 PM   #3
70GMCer
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Re: AC & Heat Vacuum Source?

I ordered this one for now...... https://www.ebay.com/itm/25204937611...84.m1497.l2649
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