Thermo King 002008, Manual

Page: 55 / 155

Engine Maintenance
55
Engine Cooling System
The engine employs 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, circulates it through
the cylinder block and head and returns it to the
radiator. A thermostat mounted in the coolant
outlet line from the cylinder head to the radiator
automatically maintains coolant temperature
within the specified temperature range.
All water cooled engines are shipped from the
factory with a 50 percent permanent type
antifreeze concentrate and 50 percent water
mixture in the engine cooling system.
This provides the following:
1. Prevents freezing down to -30 F (-34 C).
2. Retards rust and mineral scale that can cause
engine overheating.
3. Retards corrosion (acid) that can attack
accumulator tanks, water tubes, radiators and
core plugs.
4. Provides lubrication for the water pump seal.
ELC (Extended Life Coolant)
ELC has been phased into all trailer units
equipped with TK 486 engines. 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 23: 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