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Drain about 1 gallon of coolant from the radiator Remove thermostat housing Clean both surfaces Replace gasket Re-install housing Re-fill coolant slowly to prevent an airlock Start engine and look for leaks Run engine to normal operating temperature with heater on Re-check coolant level

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16y ago
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Q: How do you replace the thermostat gasket on a 1989 Isuzu trooper?
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