Topic: Humming noise at cold start-300E-24V
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Old 12-14-2007, 03:37 AM   #2 (permalink)
Jayare
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Date registered: Jun 2005
Vehicle: 86 190E 2.3 16V, 90 300CE, 93 400E, 02 Olds Aurora
Location: Seminole, FL
Posts: 1,607
It's the air pump. Mine does the same thing upon initial start every day. No to worry.

Good Luck,

Jayare
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