AC vacuum control hoses, where do they go? - NCRS Discussion Boards

AC vacuum control hoses, where do they go?

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  • Mathew S.
    Very Frequent User
    • July 9, 2015
    • 136

    AC vacuum control hoses, where do they go?

    I am in the process of putting a 1970 LS5 with AC that has been apart since the early 1990s. I purchased it last year, and am making headway, albeit slowly. I am currently trying to put the heater core back in.

    I have three vacuum hoses that I have no idea where they go. I have a pink, orange and white stripe hose. I'm have the diaphragm on the heater core box that doesn't have a hose and neither does the diaphragm on the outside footwell of the passenger compartment. The white stripe I'm guessing is for the heater control valve, but how does it pass through the firewall? If anyone knows where these go or has pictures of the routing of everything on the evaporator core it would be appreciated. I looked at the assembly manual but couldn't find page where it showed the hoses and where they go.

    once I get this part done I can then start on the engine that is currently sitting in my garage on an engine stand.
  • Alan S.
    Extremely Frequent Poster
    • July 31, 1989
    • 3415

    #2
    Re: AC vacuum control hoses, where do they go?

    Hi Matthew,
    The routing of the a/c vacuum hose routing is pretty complicated as you already know.
    The vacuum hose routing is shown the the Options Section at the back of the AIM. Look for UPC C60.
    The hoses are graphically and diagrammatically shown on sheets E1 through E5. I find the diagram on sheet E5 the most helpful, but the other sheets are needed too.
    Good Luck!
    Regards,
    Alan
    71 Coupe, 350/270, 4 speed
    Mason Dixon Chapter
    Chapter Top Flight October 2011

    Comment

    • Ronald D.
      Expired
      • March 11, 2012
      • 66

      #3
      Re: AC vacuum control hoses, where do they go?

      Doc Rebuild has some good hose diagrams also

      Comment

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