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    • John Kelly

    John D. Kelly is a professor of automotive technology at Weber State University in Ogden, Utah, and a former technician. He specializes in automatic and manual drivetrain and NVH diagnosis and hybrid and electric vehicle technology.

    Operations

    Winning the battle against axle noise and vibration

    John Kelly
    Nov. 1, 2019
    Over the years, I have received many questions related to what has become known as “Chevy Shake” vibrations on later model Chevrolet, GMC, and Cadillac trucks and SUVs.
    Figure 1 – 2017 RAM 2500 Factory U-Joints come with green and blue selective snap rings
    Operations

    The right way to troubleshoot and service universal joints

    John Kelly
    Oct. 1, 2019
    There's very little 'universal' about universal joints and their service. Learn the right way to troubleshoot and service these important driveline components.
    Figure 1 - Refilling the high voltage battery cooling system using a vacuum fill procedure on a 2017 Chevrolet Bolt EV
    Operations

    Hybrid and EV cooling system service

    John Kelly
    May 1, 2019
    It is time to get the proper training and tools to service these complex cooling systems.
    1998 Toyota RAV4 EV (left)
    Operations

    A look at hybrid and EV battery service

    John Kelly
    Jan. 1, 2019
    Learning how to test and service the HV battery is becoming as important as knowing how to test 12v systems