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A/C problem - vent not working except w. engine not running

rickmktg

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August 17, 2013
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Year, Model & Trim Level
1998 Ford Explorer
'98 Ford Explorer, 100k miles. Receiver/dryer replaced in 2005 (34,000 miles) when it rusted out.

A/C not working. Compressor does seem to come on. Set it on fan setting (there are two settings that do not use A/C, 100% outside air) and they blast very hot air. Turned engine off, turned key on, turn on vent, temp of air is exactly what it should be, outside air. Starting the car then again blasts hot air, leading me to believe that something is being closed/opened by engine vacuum that then sends 100% heat into the car, regardless of temp setting.

Just starting to research.
 
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