Chassis Information --- Section 10
The Executive 2005
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When performing maintenance, it is also necessary to inspect other components of the cooling sys-
tem.
Have an inspection performed of the surge tank cap seal and have the cap pressure tested, at each
oil change. The charge air cooler and radiator also requires an inspection for cracks, broken welds,
secure mounting, and general cleanliness.
It may be necessary to clean the radiator and external coolers more often under certain conditions.
Leaves, twigs, road debris and other contaminants can block the radiator and cooler fins resulting in
reduced cooling system performance. Blockage can vary depending on road conditions, climate, and
regional conditions. Check the radiator and external coolers weekly for blockage, and clean as required. To
clean the radiator and external coolers, compressed air is recommended. In the event that road grime,
oil, or inadequate cleaning with compressed air is encountered, a high pressure washer and degreaser
may be used with caution, as excessive pressure can bend the radiator fins.
This service includes draining the engine coolant, flushing/cleaning the cooling system, inspecting
the water pump standpipe, replacing the thermostat, gasket and seal, and replacing the coolant and SCA
element.
Coolant Hoses:
Rotten, swollen and worn hoses, as well as loose connections, are frequent causes of coolant sys-
tem problems. Overheating can be caused by a collapsed hose or a clog caused by rubber shedding
from a rotton hose. Replace any hose found to be cracked, swollen or damaged. Connections should be
inspected periodically and hose clamps tightened.
Every 12 months - Inspect all hoses, clamps, and fittings for leaks due to cracking, softness, and
loose clamps/fittings. Look for signs of fluid leaks, damaged end fittings, ballooning, chafed,
kinked, or crushed hoses, and loose clamps and fittings. Correct any deficiencies found.
Coolant Overheated:
If the engine is overheated, never pour cold coolant into a hot engine. The sudden change in tem-
perature may crack the cylinder head or block. If the engine is hot, fill slowly to prevent rapid cooling
and distortion of engine castings.
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