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Old 02-16-2022, 05:53 PM   #2
Dead Parrot
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Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,809
Re: Heater and a/c vacuum lines

You need one of those hoses to go through the firewall and connect to a round(ish) pint sized canister on the engine side of the firewall. That is where the system gets the vacuum to operate. The canister also needs a connection to manifold vacuum.
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