Coolant Hoses; Coolant System - Thawing; Charge Air Cooler - Holiday Navigator 2003 Owner's Manual

Chassis Information
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Coolant Hoses

Coolant System - Thawing

CHARGE AIR
COOLER
1 0 • 4 2 8
Rotten, swollen and worn hoses, as well as loose connections, are frequent
causes of coolant system problems. Overheating can be caused by an collapsed
hose or a clog caused by rubber shedding from a rotten hose. Replace any hose
found to be cracked, swollen or damaged. Connections should be inspected
periodically and hose clamps tightened.
The diesel engine uses compression to ignite the fuel/air charge. To
increase compression inside the combustion chamber (resulting in increased
power output) a turbocharger is added to the engine. The turbocharger is a
paired housing assembly with impellers inside each housing connected by a
common shaft. One impeller is propelled by the engine exhaust, which drives
the other impeller. The function of the other impeller is to increase compression
inside the combustion chamber by forcing air into the intake manifold. This
process works well, however, the intake air charge is heated two different
ways. Through convection by the exhaust gases driving the turbocharger and
any time air is compressed heat is produced. This has a negative effect inside
the combustion chamber resulting in lost power potential. Therefore, a Charge
Air Cooler (CAC) is installed to cool the intake air before it enters the engine.
The CAC may be mounted to either the top or side of the radiator. The CAC
performs the same function as a radiator, cooling air instead of liquid. Ambient
air passing through the CAC will cool the engine's intake air charge.
N A V I G A T O R 2 0 0 3
If the coolant system becomes frozen solid,
place the motorhome in a warm area until the
ice is completely thawed. At this point the
motorhome must be towed. If the engine is
operated when the cooling system is frozen it
will result in engine overheating due to
insufficient coolant circulation.
Once thawed, check engine, radiator and
related components for damage caused by
expansion of frozen coolant.
If the engine is overheated, never pour cold
coolant into a hot engine. The sudden change
020165d
in temperature may crack the cylinder head or
block. If the engine is hot, fill slowly to prevent
rapid cooling and distortion of engine castings.