Forward Flush

2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Forward Flush
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Black Supply Hose And Clear Waste Hose
    GM1212342Courtesy of GENERAL MOTORS CORP.
  1. Disconnect the supply and waste hoses from the vehicle cooler lines. Reverse the supply and waste hoses to provide a normal flow direction.
  2. Fig 2: Setting Main Function Switch To FLUSH Position
    GM1212343Courtesy of GENERAL MOTORS CORP.
  3. Turn the main function switch to the FLUSH position and allow the machine to operate for 30 seconds.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.