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Just follow the top radiator hose to were it clamps onto the engine, That will be the thernostat housing, just remove that housing and it will be right there. You will need to drain engine coolant first. MAKE SURE ENGINE IS COLD. That is if the engine is a 5.7L 350.

If it is something other then a 5.7L 350. Then the thermostat will be were the lower radiator hose clamps onto the engine, That will be the thermostat housing, remove it.

If it is a V6 engine then it will be at the end of the top hose, just like the 350 engine.

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Q: Where is the Thermostat 99 silverado 1500?
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