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Thread: Regulating vacuum

  1. #1
    Garrett booster
    Join Date
    Aug 2017

    Regulating vacuum

    Ok, so.... Iím restoring the dash and heater box on my 70 barracuda and I want to test all the functions of the A/C heater box. FSM says to apply 8 psi of vacuum to the switch to test functionality of the doors and switch.
    Iíd like to use a A/C vacuum pump to provide a steady source of vacuum as the dash and heater box are in my basement. Is there a way that I can regulate the vacuum so it doesnít suck the diaphragms out of my 51 year old vacuum actuators?
    Hoping someone here has an idea.

  2. #2
    Supporting Member II Turbo Mopar Contributor
    Join Date
    Feb 2015

    Re: Regulating vacuum

    Do you have a Mytivac?
    If not you will need to create a huge bleed for your pump
    using a adjustable needle valve or similar

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  3. #3
    Super Moderator Turbo Mopar Staff contraption22's Avatar
    Join Date
    Dec 2005
    Havertown, PA

    Re: Regulating vacuum

    You can actually use a Grainger valve for this.
    Mike Marra
    1986 Plymouth Horizon GLMF "The Contraption" < entertaining sponsorship offers
    Project Log:

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