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A/c works until i start working the motor

(1999 Ford Crown Victoria)
in Mansfield, PA on June 23, 2010
i have an international 900i truck (tractor trailer) i have had the pressures checked and the compressor runs. the air works good until i put the truck under load. after i let it idol for about a half hour it starts working again.. ????? any ideas
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Popular Answer
on June 23, 2010
do you have the engine cooling fan turned on while driving? the ac needs the air through the condenser.

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on June 25, 2010
yeah it runs full time
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