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Change the the positions on the A/C controller and listen for the sound. It may be a vent being pulled closed by vacuum, changing from outside air to recirculate.
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WHITE TUNDRA CLUB MEMBER #5
2007 DC SR5 TRD 5.7
JBL STEREO SYSTEM
LEATHER
VOLANT CAI
MAGNAFLOW EXHAUST
BLACKED OUT HEADLIGHTS
MUD GAURDS
EGR DEFLECTOR
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