GM Service Manual Online
For 1990-2009 cars only

Caution: NEVER spray water on a hot heat exchanger. The resulting steam could cause personal injury.

Important: The radiator and A/C condenser should be kept clean for proper system performance. Cleaning is recommended at least once a year.

Inspect the front surface of the radiator and A/C condenser. Insects, leaves, debris, etc. can affect the performance of the radiator and A/C condenser.

If the front surface of either or both of these components is found to be in need of cleaning, the unwanted material can be removed by performing the following:

  1. Ensure that the engine is OFF and cool.
  2. Blow compressed air through the radiator from the rear surface of the radiator toward the front of the vehicle.
  3. If compressed air is not available, use a water hose to force water through the radiator from the rear surface of the radiator toward the front of the vehicle.

    Important: To help ensure proper cooling system pressure performance, a pressure test of the cooling system and pressure cap is recommended at least once a year.

  4. Pressure test the cooling system and pressure cap. Refer to Cooling System Leak Testing .