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I have a '73 mustang that has the vacuum controls for the Heat and A/C dampers. I pulled the engine out for a rebuild and, when I put it all back together, I didn't make a note of where the two small vacuum lines get connected. I just hooked them both up to the vacuum system and now the controls work but I have a leaky noise in the dash when I put it on defrost. Can anyone tell me the correct place for these lines?
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One line goes to the vacuum canister on the passenger side rear apron, the other goes to the vacuum operated water shut off valve in line with your heater hose.
 
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