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Vacuum Sensing Switch Test

  1. On models with vacuum sensing switch, check continuity between terminals while applying vacuum less than 19.4 in. Hg.
  2. If switch shows continuity (switch closed), replace switch. If not, apply more than 20.6 in. Hg to switch, and recheck continuity. If no continuity now exists, replace switch.
    NOTE: Between 19.4 and 20.6 in. Hg, switch may be either open or closed.
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