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'99 Expedition makes a hissing noise from the dash when the engine is turned off

(1999 Ford Expedition)
in Lakewood, CA on July 15, 2014
This is a recent occurence and it sounds like air escaping or hissing for a few seconds when the engine is turned off after driving.

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Popular Answer
on July 15, 2014
How's the A/C been working? Any changes lately?
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on July 15, 2014
No, it works great. No changes.
on July 16, 2014
Poss. A/C system 'equalizing pressures after shutdown? Try turning the climate controls off a few minutes before you shut the truck down and see if the noise stays.
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