TM 5-3895-383-24 NOTICE Do  not  use  a  conventional  coolant  to  top-off  a  cooling system using Extended Life Coolant. Do  not  use  supplemental  coolant  additives  (SCA)  other than Extender in cooling systems filled with Extended Life Coolant. Extended Life Coolant Cooling System Cleaning NOTE: If   the   cooling   system   is   already   using   ELC, cleaning agents are not required to be used at the specified    coolant    change    interval.        Cleaning agents  are  only  required  if  the  system  has  been contaminated by the addition of some other type of coolant or by cooling system damage. Clean  water  is  the  only  cleaning  agent  that  is  required  when ELC is drained from the cooling system. ELC  can  be  recycled.    The  drained  coolant  mixture  can  be distilled.      The   distillation   process   can   remove   the   ethylene glycol and the water.  Consult your Caterpillar dealer for more information. After   you   drain   the   cooling   system   and   after   you   refill   the cooling system, operate the engine while the radiator filler cap is removed.  Operate the engine until the coolant reaches the normal   operating   temperature   and   until   the   coolant   level stabilizes.  As needed, add the coolant mixture in order to fill the system to the proper level. Diesel Engine Antifreeze/Coolant (DEAC) SMCS Code:  1350; 1352; 1395 Caterpillar     recommends     using     Caterpillar     Diesel     Engine Antifreeze/Coolant (DEAC) for cooling systems that require a heavy-duty coolant/antifreeze.  Caterpillar DEAC is an alkaline single-phase   ethylene   glycol   type   antifreeze   that   contains corrosion inhibitors and antifoam agents. Caterpillar   DEAC   is   formulated   with   the   correct   amount   of Caterpillar Supplemental Coolant Additive (SCA).  Do not use SCA at the initial fill when DEAC is used.  The coolant that is in the  engines  of  Caterpillar  machines  should  be  sampled  after every   250   hours   of   operation.      The   results   of   the   coolant sample will regulate the additions of the SCA.  The life of the coolant  for  the  Caterpillar  DEAC  is  3000  hours  or  every  two years. Caterpillar DEAC is available as either a concentrate or a 1:1 premixed cooling solution.  If concentrated Caterpillar DEAC is used,  Caterpillar  recommends  dilution  with  distilled  water  or with   deionized   water.      If   distilled   water   is   not   available   or deionized   water   is   not   available,   refer   to   General   Coolant Information    in    order    to    determine    the    requirements    for acceptable water. Commercial Heavy-Duty Coolant/Antifreezes and SCA If     Caterpillar     DEAC     is     not     used,     select     a     heavy-duty coolant/antifreeze with a low silicate content that meets "ASTM D4985"  or  "ASTM  D5345".    When  a  commercial  heavy-duty coolant/antifreeze  is  used,  the  system  must  be  treated  with Caterpillar SCA.  Maintain a concentration level in the cooling system that is between 3 percent and 6 percent by volume.  If a Caterpillar SCA is not used, select a commercial SCA.  The commercial  SCA  must  contain  a  minimum  concentration  of 1200 mg per (1200 parts per million) of nitrite content.  Follow the    recommended    guidelines    for    adding    SCA    when    you maintain the coolant.  In all cases, the Caterpillar guidelines for acceptable water must be followed. NOTE: If you do not use the Caterpillar DEAC, you must drain  the  cooling  system  annually.    The  cooling system must be flushed at this time as well. Cooling System Maintenance NOTICE Never operate without thermostats in the cooling system. Thermostats  maintain  the  engine  coolant  at  the  proper operating   temperature.      Cooling   system   problems   can develop without thermostats. Check the solution of coolant/antifreeze (glycol concentration) frequently  in  order  to  ensure  adequate  freeze  protection  and protection  from  boiling.    Check  the  glycol  level  of  the  coolant system   with   the     1U-7298    Coolant/Battery    Tester    (Degree Celsius) or with the  1U-7297  Coolant/Battery  Tester  (Degree Fahrenheit).  Consult your Caterpillar dealer for information on coolant testers. Supplemental Coolant Additive (SCA) SMCS Code:  1350; 1352; 1395 Caterpillar SCA has the following benefits: prevention of corrosion to metals prevention of deposit formations of minerals Maintenance Section Cooling System Specifications 1-28