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Dual heater core AC vacuum connections

Sonny

It’s all fun til the rabbit gets the gun.
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Jan 19, 2017
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Location
Florida
Can someone tell me how the vacuum hoses hook up under the hood? It’s a ‘70 Belvedere w/AC. Currently I have 2 hoses from the vac canister. One has the plastic bleed tube and the other is unhooked. One comes from the heater box thru the fire wall to the engine I assume? Which one goes to the water control valve?
 
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