AC Cab vacuum lines question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

REPO1 · 04-04-2002, 02:43 AM

I have a question on the 2 vacuum lines that run through the firewall. The one I know goes to a TEE that goes to both vacuum actuators. The other one I think goes to the carb? If so what port on the carb should it be hooked to? I am thinking the one on the side, just under the choke. Is that correct?

Thanks for the help guys.
Reid

------------------
Sylvan Lake, Alberta, Canada

1970 Chevy C20 Custom Camper
#s matching 402BB Turbo 400 trans.
Air conditioning, power steering, manual brakes.
73,600 Original Miles!!
(Add on 2000 more from raod trip!)

Cal69Chevy · 04-04-2002, 10:47 AM

I have a '69 with factory air and the vacuum just under the choke on my Qjet goes to the air cleaner AC hookup (not sure what the official name is but it's on the bottom side of the intake snout) It looks like I have one AC vacuum that comes off my manifold...they go to the vacuum divert switch and then back from there to control the heater valve and the external air vents.

Hope that helps you,

Ken

Slick1 · 04-04-2002, 11:00 AM

I would think you'd want intake manifold vacuum for that, so the port on the carb closest to the manifold, or a port directly on the manifodl should work.

04-04-2002, 02:43 AM	#1
REPO1 Shortbox wanna-be. Join Date: Mar 2002 Location: Fort St.John, British Columbia, Canada Posts: 773	AC Cab vacuum lines question I have a question on the 2 vacuum lines that run through the firewall. The one I know goes to a TEE that goes to both vacuum actuators. The other one I think goes to the carb? If so what port on the carb should it be hooked to? I am thinking the one on the side, just under the choke. Is that correct? Thanks for the help guys. Reid ------------------ Sylvan Lake, Alberta, Canada 1970 Chevy C20 Custom Camper #s matching 402BB Turbo 400 trans. Air conditioning, power steering, manual brakes. 73,600 Original Miles!! (Add on 2000 more from raod trip!) __________________ 1970 Chevy C20 Custom Camper 402BB Turbo 400 trans. (Slowly becoming a '70 shortbox 1/2 ton) '71 Camaro SS 402/T400 resto '97 Z28 (11.41@127MPH)

04-04-2002, 10:47 AM	#2
Cal69Chevy Registered User Join Date: Nov 2001 Location: SoCal Posts: 136	I have a '69 with factory air and the vacuum just under the choke on my Qjet goes to the air cleaner AC hookup (not sure what the official name is but it's on the bottom side of the intake snout) It looks like I have one AC vacuum that comes off my manifold...they go to the vacuum divert switch and then back from there to control the heater valve and the external air vents. Hope that helps you, Ken __________________ '69 Chevy, 4X4-SB 350 TBI-TH350 Trans-205 Transfer Case-Dana 44 Front-14 Bolt Rear-Front Disc Brakes-Factory A/C-P/S Ken's '69 Page

04-04-2002, 11:00 AM	#3
Slick1 Registered User Join Date: Mar 2002 Location: Olathe, Ks USA Posts: 29	I would think you'd want intake manifold vacuum for that, so the port on the carb closest to the manifold, or a port directly on the manifodl should work.



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