C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Vacuum line problem ?? ...help !

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Old Apr 16, 2005 | 11:31 PM
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Default Vacuum line problem ?? ...help !

I have an early 1986 with 113,000 miles that I've owned over 13 years. I just started noticing a noise in the dash as I stop with my foot off the gas. So I figure I have a vacuum leak letting the A/C, heater defroster doors move. Now to locate the problem being under the dash or under the hood. Can someone tell me where the main line going to the inside is and if there is a common problem area to start looking at ?

Thanks
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Old Apr 17, 2005 | 03:14 AM
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Haven't had to mess with mine yet but i can offer some info from my 86 manual
http://members.shaw.ca/agent86/AC%20Vacuum.pdf
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Old Apr 17, 2005 | 07:58 AM
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Does it sound like a "hiss" when you apply the brakes? If so it is likely the power brake booster.
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Old Apr 17, 2005 | 11:34 AM
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Originally Posted by Steel Blue 91
Does it sound like a "hiss" when you apply the brakes? If so it is likely the power brake booster.
No hissing just hear the doors open and close in the A/C heater system.
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Old Apr 17, 2005 | 09:30 PM
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Originally Posted by AGENT 86
Haven't had to mess with mine yet but i can offer some info from my 86 manual
http://members.shaw.ca/agent86/AC%20Vacuum.pdf

Thank you for the print out, I haven't had the extra time to start looking for the problem.
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