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Follow the top radiator hose back to the engine. There is where the thermostat housing is. Remove the hose, remove the housing, remove the old thermostat. Install the new o-ring onto the thermostat and install the thermostat into the intake manifold with the spring side pointing toward the engine. Reinstall everything and be careful to evenly tighten the housing bolts until they are snug(DO NOT OVER TIGHTEN THE BOLTS). Fill the cooling system with a 50/50 mix of coolant and water, and burp the system.

To determine the part, you can read the numbers off the original or ask at your local parts counter.

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Q: How do you replace the thermostat and what is the part number on a 1997 Ford Explorer?
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