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heater core shutoff shut off bypass plumbing

  1. Heater Core Shutoff

    Heater Core Shutoff

    For vacuum signal tee into the vacuum line that goes to the vent air door (blue on my 97, forget what color on my 86) and use a valve that CLOSES when vacuum is applied. Contrary to popular belief it is not necessary to use a valve that bypasses when shut so plumbing is considerably simpler.
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