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86 s 15 heater control vacuum diagram

Discussion in 'Chevy Trucks' started by 86CrewcabK30, Sep 15, 2008.

  1. 86CrewcabK30

    86CrewcabK30 Junior Member
    from iowa
    Messages: 21

    Can anyone tell me the color codes on the vacuum lines on the back of my heater/ac controls? I mainly just need to know what line should have vacuum to control the rest. Just bought this to use for commute and hunting. Trying to get heat and defrost before the good weather sets in! :D Haven't had any luck searching for it and none of my manuals show it. Thanks in advance for any help!!!:drinkup:
  2. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Check the source hose from right where it breaks out through the firewall and heads over to the vacuum reservior...that's usually where they break.

    Here's the connector end view for the rear of the HVAC control panel (port #1 is what your after):