1996 Ford E Series Van E250 Which C On Fan Blowing Accelerating Hill Airflow

1996 FORD E-SERIES VAN
127 MILES
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Have a 1996 E250 Van which when I have A/C on and fan blowing. When accelerating on a hill all airflow diverts to defrost vents.If let up on gas the air comes back to the A/C vents. I have a vacuum gauge under dash and vacuum stays at 18 to 20 while this happens. What could be causing this?
Ford dealer where I live could not figure it out. Also a A/C n Heat shop couldn't either.
Jan 11, 2013 at 9:02 PM
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SATURNTECH9
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Have you checked to see if the mode valve holds vacuum?
Jan 11, 2013 at 9:10 PM
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