GM Service Manual Online
For 1990-2009 cars only
    • Inspect the condition of all hoses and clamps:
       - Inspect the hoses for flexibility and no signs of bulging.
       - Inspect the hoses for cracks, cuts, kinks and areas of possible leaks.
       - Inspect the brackets, supports, ties and clamps.
       - Replace and adjust the hoses and clamps as needed.

       Important: Keep the front of the radiator clear for proper cooling.

    • Clean the front face of the radiator annually.
       - Clean the front face of the condenser.
       - Remove bugs, leaves, and other foreign material by blowing compressed air through the radiator.
       - Blow the air from the rear toward the front. If compressed air is not available, use a water hose in order to force water through the radiator.
       - Use water only with the engine not running and cool.

Do not brush the radiator fins. The radiator fins are necessary for good heat transfer. Brushing damages the fins and reduces heat transfer.