Buick LeSabre 1986-1999
Buick Park Avenue 1996-1999
Oldsmobile 88 1992-1999
Oldsmobile Delta 88 1986-1988
Oldsmobile LSS 1996-1999
Pontiac Bonneville 1987-1999
Make sure the engine is cool and the vehicle is parked on a level surface, remove the radiator cap by performing the following:
- Slowly rotate the cap counterclockwise to the detent.
- If any residual pressure is present, WAIT until the hissing stops.
- After the hissing noise has ceased, press down on the cap and continue rotating it counterclockwise to remove it.
- Remove the recovery bottle or surge tank cap.
You may want to attach a short piece of hose or tubing to the radiator drain tube to prevent the coolant from running everywhere during draining.
- Place a fluid catch pan under the radiator. Open the radiator drain valve, which is located at the bottom of the radiator tank, by turning it counterclockwise. It may be wise to coat the fitting with penetrating lubricant before you attempt to turn it. Also, it's a good idea to attach a hose to the drain tube to prevent a mess. Allow the coolant to completely drain from the radiator.
- Remove the thermostat housing cap and thermostat, or open the air bleed vent(s), if applicable.
- Remove the drain plug(s) from the engine block (located on the engine block, above the engine oil pan) and allow the coolant to drain.
- Allow the coolant to drain completely from the vehicle.
- Close the radiator drain valve, then reinstall any block drains which were removed.
- Using a 50/50 mixture of antifreeze and clean water, fill the radiator to the bottom of the filler neck and the coolant tank to the FULL mark.
- Install the radiator cap, making sure the arrows line up over the overflow tube leading the reservoir or surge tank. Place the cap back on the recovery bottle or surge tank.
- Start the engine. Select HEAT on the climate control panel and turn the temperature valve to full WARM. Run the engine until it reaches normal operating temperature. Check to make sure there is hot air flowing from the floor ducts.
- Check the fluid level in the reservoir or surge tank and add as necessary.
- If necessary, you can pressure check the cooling system for leaks.