OCT 2015-- General Motors LLC (GM) is recalling certain model year 2014-2015 Chevrolet Silverado and GMC Sierra trucks manufactured January 24, 2014, to February 26, 2014, 2015 Chevrolet Suburban vehicles manufactured February 12, 2014 and Chevrolet Tahoe vehicles manufactured February 6, 2014, to February 13, 2014. In the affected vehicles, the ignition lock actuator may bind, making turning the key difficult or causing the ignition to get stuck in the "Start" position. Lower the steering wheel and pry off the paneling around the driver's side dash, the HVAC controller and the radio. Unscrew the bolts on either side of the HVAC controller, push in the clips, and then pull it out. Disconnect the electrical harnesses. Connect the new HVAC controller and slide it into the housing. SOURCE: 1997 Chevrolet Silverado 1500 5.7 vortechTruck Hello Joey325, Look under the hood on the fire wall behind the engine there is a black cover with 3 tall black what look like nuts. remove them and you will see a relay center, now there should be a brown wire marked timing may be not marked but pretty sure its brown just unplug it and go from there. Fan motor works fine, Tem switch works fine, but the other is stuck blowing out in defrost no mater which vent you turn to. I am trying to determine if it is the HVAC control module or the MODE actuator? before i buy any parts. Dealer wants 110.00 to Diag truck. Wants 1.5 hr labor to fix it, and the module is 324.00 at the Chevrolet dealer.