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Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install a new O-ring seal on the thermostat bypass pipe.
  2. Lightly lubricate the O-ring seal with coolant.
  3. Install a new O-ring seal for the bypass pipe to the water pump.
  4. Install the bypass pipe in the thermostat housing.
  5. Install the thermostat housing. Refer to Thermostat Housing Crossover Replacement (6.6L Engine) .
    Fig 1: Install Thermostat Bypass Pipe & O-Ring Seal
    G02109193Courtesy of GENERAL MOTORS CORP.
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