hiss sound need help?
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Elder User
Joined: Mar 2009
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From: eastern shore,MD
hiss sound need help?
have an 00 X yesterday heard a hiss sound from rear inside of truck. found the noise to in the compartment in the far back pass side. noise only happens when ac is on. and now AC does not blow cold air???
Post Fiend
Joined: May 2006
Posts: 10,007
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From: Central Florida
I believe there was a dual core system in the excursion and a core in one of the rear pillars. Look at the interior pillars and one will be thicker or bigger than the rest and show some sign of duct work into the rear vents.
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