Thermo King UT-1200, Manual

Page: 93 / 169

Engine Maintenance
93
ELC (Extended Life Coolant)
The maintenance interval for ELC is 5 years or
12,000 hours. 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 162: 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 nitrites)
• Havoline Dex-Cool (nitrite free)
• Shell Dexcool
• Shell Rotella
• Havoline XLC (Europe)
• Saturn/General Motors Dex-Cool
• Caterpillar ELC
• Detroit Diesel POWERCOOL Plus
NOTE: The use of 50/50 percent pre-mixed
Extended Life Coolant (ELC) is recommended to
assure that de-ionized water is being used. If
100 percent full strength concentrate is used,
de-ionized or distilled water is recommended
over tap water to insure the integrity of the
cooling system is maintained.
Antifreeze Maintenance Procedures
As with all equipment containing antifreeze,
periodic inspection on a regular basis is required
to verify the condition of the antifreeze. Inhibitors
become worn out and must be replaced by
changing the antifreeze. Change green or
blue-green engine coolant every two years.
Change ELC (red) engine coolant every five years
or 12,000 hours (whichever occurs first).
Do not mix green or blue-green engine coolant
with ELC (red) engine coolant. See “ELC
(Extended Life Coolant)” for more information
about ELC.
The factory recommends the use of a 50/50
percent antifreeze mixture in all units even if they
are not exposed to freezing temperatures. This
antifreeze mixture will provide the required
corrosion protection and lubrication for the water
pump.
Checking the Antifreeze
Check the solution concentration by using a
temperature compensated antifreeze hydrometer
or a refractometer designed for testing antifreeze.
Maintain a minimum of 50 percent permanent
type antifreeze concentrate and 50 percent water
solution to provide protection to -30 F (-34 C). Do
not mix antifreeze stronger than 68 percent
permanent type coolant concentrate and 32
percent water for use in extreme temperatures.
AJA1947
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.