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Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the thermostat housing. Refer to Thermostat Housing Crossover Replacement (6.6L (LLY) Engine) .
  2. Remove the bypass pipe from the thermostat housing.
  3. Remove and discard the O-ring seals from the bypass pipe and the water pump.
  4. Clean the sealing surfaces of the bypass pipe.
    5. Fig 1: View Of Water Pump Inlet Pipe
    GM1335432Courtesy of GENERAL MOTORS CORP.
  5. If required, clean and inspect the bypass pipe and thermostat housing. Refer to Thermostat Housing Cleaning and Inspection in Engine Mechanical - 6.6L (LLY).
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