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.

       Important: Remove bugs, leaves, dirt and other debris by blowing compressed air through the engine side of the radiator.

    • Some conditions may require the use of warm water and a mild detergent.
    • Clean the A/C condenser fins.
    • Clean between the A/C condenser and radiator.
    • Clean the radiator cooling fins.
    • Straighten any damaged cooling fins.
    • Vehicles equipped with a diesel engine, clean between the charged air cooler and the A/C condenser also.
        Removal of the charge air cooler may be necessary to clean the fins. Refer to Charge Air Cooler Replacement for the 6.6L engine or Charge Air Cooler Replacement for the 7.2L engine or Charge Air Cooler Replacement for the 7.8L engine.