It is always a good thing to replace the thermostat when replacing the water pump. Not really that it is necessary, but it will prevent opening up the system again in the near future. Also water hoses should be checked and when dried out replaced at the same time. At this time you should also replace the radiator cap, if it was not done lately. The radiator cap will regulate the pressure in the cooling system. The higher pressure is necessary to raise the boiling point of the coolant.
The O-ring seal is integral to the thermostat housing
Thermostat housing-4.8L, 5.3L and 6.0L engines
To install:
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