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Help. Humming sound on cold start

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04-07-2009, 11:36 AM	#1
stevejlh Registered User Join Date: Apr 2009 Location: US Posts: 2	Help. Humming sound on cold start When starting my 1999 Boxster during cold start (when the car has been sitting for 2 or more hours) there is a humming sound located behind passenger side on right. This humming is loud as if a small motor or pump is running, then shuts off after around 1 min. Does anyone know what this may be?

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