air escaping sound with driver side window down for first mile or two of driving

Asked by Apr 13, 2014 at 07:27 PM about the 2000 GMC Sierra 1500 SL 4WD Standard Cab LB

Question type: Maintenance & Repair

The sound is similar to air escaping from a tire valve and lasts for several seconds.  The tire air valves are OK.  It does no occur at idle, only when the truck is driven.  The sound happens several times during the first mile or two of driving.  Any ideas?

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Oonce you start the car, open the hood and see if you can hear the noise. Might be a vacuum leak.

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