another vacuum actuator question

Discussion in 'The Big Chill' started by mrh, Jun 13, 2019.

  1. mrh

    mrh Well-Known Member

    I have a 71 skylark. I have the vacuum hose chart that shows blue vacuum line goes to the defroster actuator and the pink line goes to the A/C and heater mode actuator. My question is what actuator is the defroster . my heater box has an actuator on the very end of the box and one in the center of the box. Which is the blue and which is the pink line.?

  2. 12lives

    12lives Engage! - Jean-Luc Picard

    The one at the end operates the defrost door:
    IMG_0721.JPG IMG_20190612_154049_677.jpg
  3. Steve Craig

    Steve Craig Gold Level Contributor

    Pull a slight vacuum on each & see what it operates inside the box. Chassis Manual might get you a pic of the ducting incorporated in the system & mounted under the dash.
  4. Dr. Roger

    Dr. Roger Stock enthusiast

    Yeah, if it holds vacuum the diaphragm is still good.

Share This Page