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Old 11-08-2003, 09:32 PM
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Vacuum Trouble - Chevy 350

Hey guys..... 2 small questions....

easiest first....

Rochester Quadrajet.... where's the idle screw? (1985)


vacuum on a 75 chevy 350
where do I hook the heater up to? I can't find where the vacuum starts..... where it comes in? Sounds like a dumb question, I probably need to give more info, probably gonna get a wide range of answers <grin> but thanks for any help!


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Old 11-08-2003, 09:48 PM
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You looking for idle mixture or speed screw?

What heater who?

Are you looking for the heater blend door vacuum connection, any where on the manifold will work.

Are you looking for blend door hose. You might find it under the dash. It's normally a hard plastic line that passes through the fire wall about valve cover height.

YES, you need to give more info.
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Old 11-08-2003, 10:37 PM
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First answer: Qjet idle speed screw is on the drivers side of the carb. Its a slotted 1/4" screw that moves the linkage back and forth. BUT----- If its a computer controlled Qjet, there will be an idle motor that controls the actual idle speed.

Second. Vac source for all heater/AC controls starts at the back of the intake manifold, hose goes to the pass side vacuum canister, then changes to a small plastic line that goes through the firewall and on to the dash controls.
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