DESCRIPTIONHeavy duty fan upgrade option for Trailblazers! This kit includes two high flow 12 inch Spal fans and a custom black powder coated shroud that uses factory mounting points – no drilling or cutting needed! Fits 5.3L and 6.0 Trailblazers/Envoy/GMT360. This conversion eliminates the power robbing stock electro-viscous fan and replaces it with two computer controlled electric fans. Each fan is independently controlled by the PCM.
Three Relay Spal Kit – Complete kit with harness that will bring both fans on at half speed for the LOW setting for quieter operation, and both fans on at full blast for HIGH.