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basic vac needs for heater

Discussion in 'A/C & Heater systems - HVAC' started by Four0Sport, December 16, 2019.

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  1. Four0Sport

    Four0Sport Jack Pewe Elite Explorer

    August 26, 2004
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    City, State:
    West Virginia
    Year, Model & Trim Level:
    1993 2dr
    I have eliminated the ac system as well as the IAT diaphragm on the air box lid. Do I need to retain the check valve on the vac lines for the heater mode to remain functional?
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