Engine Maintenance
91
Engine Cooling System
The engine uses a closed, circulating type,
pressurized cooling system. Correct engine
temperatures are controlled and maintained by a
radiator, fan and thermostat. The coolant is
circulated through the system by a belt-driven
centrifugal pump. The pump draws the coolant
from the side of the radiator. It circulates the
coolant through the cylinder block and head and
back to the radiator. A thermostat is mounted in
the water outlet from the cylinder head to the
radiator. It automatically maintains coolant
temperature within the specified temperature
range.
All water-cooled engines are shipped from the
factory with a 50% permanent type antifreeze
concentrate and 50% water mixture in the engine
cooling system. Benefits include:
1. Prevents freezing down to -34 C (-30 F).
2. Retards rust and mineral scale that can cause
the engine to overheat.
3. Retards corrosion (acid) that can an attack
accumulator tank, water tubes, radiator and
engine block plug.
4. Provides lubrication for the water pump seal.
ELC (Extended Life Coolant)
ELC has been phased into all container units
equipped with engines from the TK486 engine
family. A nameplate on the coolant expansion
tank identifies units with ELC.
NOTE: The new engine coolant, Texaco
Extended Life Coolant, is RED in color instead
of the current GREEN or BLUE-GREEN
colored coolants.
Figure 53: ELC Nameplate
Located On Expansion Tank
The following are the Extended Life Coolants
currently approved by Thermo King for use in
ELC units for five years or 12,000 hours:
• Chevron Dex-Cool
• Texaco ELC (nitrite free)
• Havoline Dex-Cool (with nitrates)
• Havoline Dex-Cool (nitrite free)
• Shell Dexcool
• Shell Rotella
• Havoline XLC (Europe)
• Saturn/General Motors Dex-Cool
• Caterpillar ELC
• Detroit Diesel POWERCOOL Plus.
CAUTION: Do not add “GREEN” or
“BLUE-GREEN” conventional coolant to
cooling systems using “RED” Extended
Life Coolant, except in an emergency. If
conventional coolant is added to Extended
Life Coolant, the coolant must be changed
after 2 years instead of 5 years.
AJA1947
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