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Very weird noise seemingly coming from behind dash???

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Old Jun 24, 2020 | 08:30 PM
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Default Very weird noise seemingly coming from behind dash???

Hey everyone, this noise sounds like its coming from behind the dash. Starts up a second after turning the truck on, and stays on a few seconds after turning it off.

98 4x4 2-door

 

Last edited by Xander12; Jun 24, 2020 at 08:57 PM.
Old Jun 24, 2020 | 10:03 PM
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Hard to tell in the video. If it's a "hissing" sound, a possible source could be a dislodged or rubbed through vacuum line that goes to the HVAC controls. Are all the AC/heater vent functions working properly?
 
Old Jun 25, 2020 | 10:05 AM
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Originally Posted by blazen_red_4x4
Hard to tell in the video. If it's a "hissing" sound, a possible source could be a dislodged or rubbed through vacuum line that goes to the HVAC controls. Are all the AC/heater vent functions working properly?
It does sound kind of hissy. Very hard to describe. The sound lowers in volume when i hit the gas. The vents are working good and blowing.
 
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