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Old Sep 28, 2019 | 07:40 PM
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onehundred80
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Joined: Apr 2006
Posts: 25,432
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From: Ontario
Default Re: An hissing sound coming from the vents !

There are vacuum valves under and behind the dash, one is under the glove box. Finding the leak maybe be a problem. The valves work without air blowing in the system and this should help.
 
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