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CumminsPower97

08-03-2011 03:07 PM

???

one quick question, on my 97 when im drivin down the road i can hear a hissin noise comin from the defrost vents in the dash.. it starts when my boost hits rite around 15psi and jus gets louder the higher it gets...does anyone have a clue what mite b causin this and how to fix it..any info would b great Thanks

sjcoan

08-03-2011 05:51 PM

My guess would be that its the turbo singin. Have you takin out your silencer ring

turbo2332

08-03-2011 08:31 PM

man i think i have the same issue? like passenger side glovebox area? almost sounds like running water? its got me stumped too

aguilar_15

08-03-2011 10:28 PM

I'm thinkin the turbo? Unless yall have something hung on the brake rotor, but doubt that's it. AC maybe?

1993firstgennewbie

08-04-2011 10:12 AM

could be the heater core they can make a gergling or hissing sound

daveO

08-04-2011 01:38 PM

How do you have the line routed for your boost gauge. Maybe it has a hole in it?

RUSS83

08-04-2011 03:25 PM

WHEN MY 95 HAD A HOLE IN THE HOSE I COULN'T BUILD OVER 5LB BOOST AT WOT

EFS463

01-21-2012 05:30 PM

I have this same noise did you ever figure out what it was

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