Question about 1999 Oldsmobile Aurora
For 1999 Oldsmobile Aurora 4.0L
SFI DOHC 8cyl check thie how to replace a Thermostat:
1. 3/8 in. Drive Ratchet
2. Needle Nose Pliers
4. Cooling System Pressure Tester
5. Socket Set
6. Radiator Hook Tool
Step 1 Open the hood and locate the vehicle’s radiator.
o Tip: Make sure the vehicle has cooled down before inspection.
o Tip: Safety Tip:Always wear safety glasses when working on your vehicle. Wear other personal protective equipment (PPE) when necessary, for example latex gloves or safety shoes.
Step 2 Remove the vehicle’s radiator cap and use a radiator pressure tester to check for leaks.
Step 3 Drain out some of the engine coolant in the radiator so the coolant level is below the thermostat housing to prevent leaking when replacing the thermostat.
Step 4 If necessary, remove the upper radiator hose.
o Tip: A twisting motion may help to initially break the upper radiator hose loose. You can also use a flathead screwdriver to help pry the hose off. Make sure not to damage the hose.
Step 5 Remove the thermostat housing bolts.
Step 6 Remove the thermostat housing.
Step 7 Remove the thermostat.
o Tip: Make sure to note the way the thermostat is installed. Installing the thermostat backwards will affect how the cooling system performs.
Step 8 Clean the mounting surfaces. Install the new thermostat as it was removed and always use a new thermostat gasket.
Step 9 Reinstall thermostat housing and tighten mounting bolts evenly. If applicable, reconnect the upper radiator hose.
Step 10 Refill the cooling system with coolant.
Step 11 Start the vehicle with the radiator cap off and allow the engine to run for several minutes. This allows the air bubbles to escape the cooling system.
Step 12 Reinstall the radiator cap.
Step 13 Run the engine until up to normal operating temperature. Remember to keep an eye on the temperature gauge to prevent overheating.
Hope helps (remember rated)
Posted on May 31, 2010
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Posted on Jan 02, 2017
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