In Cab Ventilation System

Asked by May 12, 2018 at 01:21 PM about the 2015 Chevrolet Silverado 1500 LT Double Cab

Question type: Maintenance & Repair

I have  a 2015 Chevy Silverado 1500 LT 2wd pick up.  When I have the A/C system off and fan completely off I noticed that outside air still comes through the vents while I am driving.  Also, when I get my truck washing and the air blower at the end of the wash blows the water off my truck the blower air is also coming through the vents.  Why is the air allowed to come in?  

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