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Q: A/C air is cool not cold can hear hiss like a vacuum leak coming from dashboard on 2003 Ford Thunderbird

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Hissing mostly occurs when accelerating.
(3) Answers
this car has several different valves that control the a/c and heater. a dealer can run diag on your a/c to see if it is more than just a Freon concern. did one not to long ago, heater valve stuck open. no cold air. set a code in the control module.
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