Holiday Navigator 2003 Owner's Manual page 429

After leaving the turbocharger, intake air is compressed and heated to
approximately 300º to 375º F., depending on the engine load and throttle
position. Before the air enters the intake manifold, the CAC cools the intake
air temperature to the engine manufacturer's specifications. Lower intake air
temperatures reduce exhaust emissions, improve fuel economy and increase
horsepower. The CAC will continually expand and contract up to ¼" as throttle
increases and decreases.
Visually inspect the charge air cooler, every six months, for dirt and debris
that may be blocking the fins. If the motorhome develops an oil leak, there is a
possibility that the oil will coat the fins of the CAC. Dust will adhere to the oil
film and eventually clog the fins greatly reducing cooling efficiency. When the
oil leak is repaired, the CAC must be thoroughly cleaned.
Rear mounted radiators, with a top mounted CAC, will require more
frequent visual inspections than a side mounted CAC. Litter and dust along
the roadway can restrict the airflow on this type of system. During each oil
change inspect the engine side of the radiator/CAC assembly for foreign
objects that may be causing restriction.
Spraying degreaser on the charge air cooler, as well as using a steam cleaner,
will not damage the CAC. However, pressure washer and steam cleaner
nozzles placed too close to the CAC can bend the fins. The recommended
cleaning procedure for the CAC and the radiator, is to use a bucket of mild
soap and water. Carefully wash with a bristle brush then rinse using a garden
hose, with minimum water pressure, standing back a distance to avoid bending
the fins.
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N A V I G A T O R 2 0 0 3
Chassis Information
090388B
1 0 • 4 2 9