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  1. No Air Flow through Dash Vents

    General Discussion
    :help I have a 2001 Extended Cab 4x4 Duramax. All factory, no aftermarket parts (except a K&N air filter element). For the last few years I've had issues with my Air Conditioning and still can't get it to work right. Here is the issue, after 60 minutes of use (normal or max A/C) the air...