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Not sure which engine you have, but for the 4.0 just drain the system, unbolt the thermostat housing from the engine ( right where the upper radiator hose meets the motor ) remove the old thermostat ( pay attention to how it is positioned ) remove all old gasket material, apply water resistant rtv to both sides of new gasket, install new thermostat, install thermostat housing, bolt on tight.

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12y ago
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Q: How do you replace the thermostat on a 2004 jeep wrangler?
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