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As far as i know all a/c trucks had a vacuum actuated passenger side vent. I've seen some where a non-a/c manual actuator was added because the vacuum actuator died.
Jim, my system had a y in it for which runs both air doors off a single line, leaving me w/ an extra, unless it is for the heater control valve.
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72 lwb 468/th400/3.73 2/4 drop primer
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