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.

Notice: The heat exchanger fins are necessary for good heat transfer. Do not brush the fins. This may cause damage to the fins, reducing heat transfer.

    • Clean the front face of the air conditioning (A/C) condenser.
    • If equipped with a 6.6 L diesel engine, clean between the charged air cooler, A/C condenser, and radiator.
        It may be necessary to remove the charged air cooler to completely clean the fins, if so refer to Charged Air Cooler Replacement in Engine Mechanical - 6.6 L.
    • Remove bugs, leaves, etc. by blowing compressed air through the radiator.
       - Blow the air from the rear toward the front. If compressed air is not available a water hose can be used to force water through the radiator.
       - Use water only with the engine NOT running and cool.