2005-GMC Envoy - there is an odd whistling sound coming out of my dash area. You can hear it when the hood is open too. Mechanics I've been to are at a loss
Cars & Trucks - GMC - Envoy XL - 2003 GMC Envoy Xl
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Answers & Comments
The first thing i can think off is the secondary air injection pump,this makes a noise as you stated, and does so on start up's.