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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 648 (Engine Cooling System) >> Repair Instructions >> Thermostat Bypass Pipes Replacement (6.6L Engine) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 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 crossover.
  5. Install the thermostat housing crossover with the thermostat bypass pipe attached. Refer to Thermostat Housing Crossover Replacement (6.6L Engine) .