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#1
01-17-2010, 08:14 PM
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2000 Sonoma hissing under dash when heat/ac off
Just bought a 2000 SLS. Has a hissing vacuum noise when heat / ac is in off position only. pulsates. door switcher seems to work. Dash tear-down? mixer?
 thanx
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#2
01-17-2010, 08:58 PM
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Re: 2000 hissing under dash when heat/ac off
Could very well be a vacuum leak. There are at least 3 vacuum operated blend doors under the dash. Does the vehicle have Auto climate control or manual heat/ac?
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