Fan/Whistling Noise / Cabin air filter replacement - Page 7 - Chevy Colorado & GMC Canyon
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post #121 of 121 (permalink) Old 05-13-2017, 09:44 PM
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Fan/Whistling Noise / Cabin air filter replacement

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Originally Posted by CopperRedCanyon View Post
I didn't go through the entire thread to see if anyone else's truck is the same as mine but mine will whistle when the recirculation switch is on and driving above 40 mph or so. If I cycle the recirculation switch off then on again it will stop whistling, then when the truck sits for a while it will start whistling again next time I start it and drive. It's like the door isn't closing all the way when the hvac system starts. I haven't been to the dealer with it yet though.


Same here. When I hear the whistle I just toggle the air circulation off and on again. It fixes it every time. I always figured it had something to do with the active grill shutters.
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