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Follow the upper radiator hose from the radiator to the top of the engine. There will be 2 bolts once you have drained the radiator you can remove these bolts that hold the waterneck housing down lift it up, and there will be the thermostat. Follow the upper radiator hose from the radiator to the top of the engine. There will be 2 bolts once you have drained the radiator you can remove these bolts that hold the waterneck housing down lift it up, and there will be the thermostat.

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Q: Where is the thermostat in a 1991 Toyota truck?
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