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1. Thermostat on the 3.5 Liter V6 is located on the right front of the engine just above the alternator.

2. Disconnect 2 small hoses and radiator hose from the thermostat housing.

3. Remove the 2 10mm bolts that fasten the thermostat housing to the engine block.

4. Remove the thermostat housing from the engine block.

5. The new thermostat comes installed in a new housing and is usually a dealer only stocked item.

6. Install new thermostat and housing unit and fasten with 2 10mm bolts. Do not over torque!

7. Re-install hoses.

8. Top up coolant, start up the engine and check for leaks.

9. Let engine reach operating temperature.

10. When engine has cooled sufficiently, recheck coolant level.

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Q: How do you replace the thermostat in a 1999 Oldsmobile intrigue?
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