Engine Maintenance
96
ELC (Extended Life Coolant)
ELC has been phased into these units as of the
first quarter of 2001. 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 126: 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 (nitrite free)
• 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.
ELC cannot be used in all older units. The water
pump seal bellows and o-rings used on older units
are not compatible with ELC.
To upgrade new production engines for ELC use,
all water pump seal bellows were changed from
NBR to HNBR elastomer, and the o-rings
upgraded from NBR to EPDM elastomer. These
changes were made as of TK 3.95 engine serial
number K19855.
Units with engine serial numbers K19855 and
after can be changed over to ELC coolant. The
cooling system must be flushed until all traces of
green or blue-green coolant dye are gone, and the
discharge fluid (water) is clear. The system can
then be filled with extended life coolant (ELC).
Units with engine serial numbers before K19855
must have the water pump replaced to change
over to ELC coolant. See Service Bulletin
T&T 275 for information about retrofitting the
new water pump.
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.
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