Now available – plug and play manual fan control for your PCM of NC electric fan harness! Available for 5.3L & 6.0L Trailblazer, and 2003 & up full size trucks. Perfect for going to the track or otherwise operating the fans without the truck running to bleed off excessive heat. Attractive rocker switch offers both LOW and HIGH operation of fans. Installation is a breeze, simply plug inline to your current PCM of NC fan harness, attach ring terminal to a ground, and run switch to be mounted inside of the vehicle! NOTE: Fan codes P0480, p0481, and p0483 need to be disabled in your tune, and set to NO ERROR REPORTING. We will do this for free if you send in your ECM.