Sierra 3500 4WD V8-6.6L DSL Turbo (2007)
19. Remove the water pump inlet pipe bolts.
20. Remove the thermostat housing crossover bolts and nuts.
21. Remove the thermostat housing crossover, with the bypass pipe.
22. Remove and discard the thermostat bypass pipe to water pump O-ring seal.
23. Remove and discard the thermostat housing crossover gaskets.
24. If necessary, perform the following:
1. Remove the thermostat bypass pipe from the thermostat housing crossover.
2. Remove and discard the thermostat bypass pipe O-ring seal.
3. Remove the thermostat cover bolts and cover.
4. Remove the thermostats.
5. Remove and discard the thermostat seals.
25. If required, clean and inspect the thermostat housing. Refer to Engine Coolant Thermostat Housing Cleaning and Inspection.
Installation Procedure
