Service Procedure

IMPORTANT:
All "W" cars and "H" cars require a total of 16 grams of coolant sealant pellets per vehicle engine cooling system. The Buick Park Avenue ("C" car) requires 20 grams of coolant sealant pellets per vehicle engine cooling system.

1. Remove the engine intake air snorkel assembly from the throttle body (t/b) and air box.

2. Remove the bolt from the t/b support bracket at the throttle body.

3. Loosen the bolt from the t/b support bracket at the cylinder head and move the t/b support bracket away from the throttle body.

4. Remove one of the 3 t/b nuts.

5. Apply thread locker (p/n 12345382 U.S. /10953489 Canada) to the stud.

6. Install a new t/b spring nut (p/n 11517293) and tighten finger tight.

7. Repeat steps 5 through 7 for remaining t/b nuts.

8. Torque the 3 t/b spring nuts to 10 Nm.

9. Reinstall the t/b support bracket into position.

10. Reinstall and torque the t/b support bracket bolt to 10 Nm.

11. Torque the t/b support bracket bolt at the cylinder head to 10 Nm.

CAUTION:
To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if radiator cap or surge tank cap is removed while the engine arid radiator are still hot.

12. Remove the vehicle radiator cap.

13. Remove an appropriate quantity of coolant pellets from package and pulverize the pellets in a plastic bag. The Park Avenue cooling system requires 20 grams of pellets and all the other vehicle cooling systems require 16 grams of pellets.

14. Install the crushed pellets through the radiator neck after adjusting the coolant level to accommodate the pellets.

15. Add coolant as required and reinstall the radiator cap.

16. Install the GM Identification Label.