air sucking under dash - Engine and Car Noises


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air sucking under dash

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Auto Repair Home>> Automotive Repair>> Engine and Car Noises

Wags391
New User

Jun 15, 2005, 12:10 AM

Post #1 of 3 (3000 views)

air sucking under dash	Sign In

In my 92 Chevy Blazer, S10, I hear a sucking noise. Like a vacuum hose is loose. It goes away when I accelerate, but immediately returns upon braking. It sounds like it's coming directing from behind the dash behind the steering wheel.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 15, 2005, 4:46 AM

Post #2 of 3 (2995 views)

Re: air sucking under dash	Sign In

That's classic for a vacuum leak - start looking around while it's hissing to find what and where

DanD
Veteran / Moderator
DanD profile image

Jun 20, 2005, 1:49 PM

Post #3 of 3 (2953 views)

Re: air sucking under dash	Sign In

You could try pinching off the large hose under the hood that goes to the brake boost, start the truck and have a listen if the noise is gone.
DO NOT TRY DRIVING THE VEHICLE WITH THAT HOSE PINCHED OFF, you will not have any boost for the power brakes.
Let us know what you find.
Dan.

Canadian "EH"

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