SECTION 303-12: Intake Air Distribution and Filtering
2014 Flex Workshop Manual
GENERAL PROCEDURES
Procedure revision date: 05/02/2013

Charge Air Cooler (CAC) Cleaning


Material
Item Specification
Metal Brake Parts Cleaner
PM-4-A or PM-4-B (US); CPM-4 (Canada) 		—
 

Charge Air Cooler (CAC) Cleaning

  1. NOTICE: Do not use a high-pressure power washer to clean the Charge Air Cooler (CAC) or damage to the CAC may occur.

    NOTE: Drain all contaminates such as coolant, fuel and oil prior to cleaning the Charge Air Cooler (CAC).

    NOTE: Thoroughly clean the joint clamp areas as well as the turbocharger connection, engine connection and the CAC connections, using metal brake parts cleaner.

    Lay the CAC flat with the inlet and outlet ports pointing up.

  1. NOTE: Plug or cap the CAC openings prior to agitating.

    Add an appropriate amount of commercially available detergent cleaner such as Simple Green Pro HD, or equivalent to the CAC . Follow the manufacturer's directions for cleaning. Fill the CAC to 40% of its volume with water.
  1. Raise one end of the CAC and agitate it by hand for at least 5 minutes.
  1. Raise the opposite end of the CAC and agitate it by hand for at least 5 minutes.
  1. Drain the CAC .
  1. Flush the CAC thoroughly with clean water.
  1. Repeat Steps 1 through 6 until no contaminates are found in the flush water.
  1. Allow the CAC to air dry.

  1. NOTE: The following leak test steps must by performed prior to installing the CAC .

    Install the CAC Y-pipe, gasket and bolts.

  1. NOTE: Use a commercially available kit, such as the Johnson Manufacturing Company Charge Air Cooler Test Set Part No. 351-CAS, or equivalent.

    Install the commercially available CAC cooler tester on the CAC following the manufacturer's installation instructions.

  1.  WARNING: Never exceed the specified pressure. Excessive pressure may cause the test adapter to blow off or may damage the charge air cooler (CAC). Failure to follow this instruction may result in serious personal injury.

    Slowly apply air pressure to 150 kPa (22 psi).
  1. Let the CAC stand for a few minutes and note any loss in pressure.
  1. Repeat Steps 11 and 12 as many times as necessary to verify the readings. The reading is considered verified when 3 consecutive tests show approximately the same pressure drop.