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2000 Ford Expedition Question: I had my a/c serviced now the rear unit hissing.

 

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markr5175, 4.6L V8, Lake Worth, FL, November 15, 2012, 07:06
 Rookie

I turned a/c unit on to defrost and a fine mist of freon came out of the air vents in the front.Within seconds i heard a hissing noise from the rear unit. Do I need to replacing everything in the rear of the truck? The system is blowing totally warm now.

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