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1990 Ford HVAC

\015 OK Fixers, I am an ASE certified HVAC tech, but I need some help. I have a 1990 Ford full sized Bronco, I have replaced all of the vacuum lines for the HVAC and tested all of the vacuum motors for the blend air, but this truck still will not stay in "MAX" under acceleration, I live in south Texas and need my HVAC to recirculate and not bring in outside air. What am I missing?\015 Posted / edited by AnonymousUser on : 10-12-2018

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