TM 5-3895-382-24 Conventional Cooling System Maintenance Check  the  antifreeze  solution  frequently  in  cold  weather to    ensure    adequate    freeze    protection.        Test    the concentration    or    submit    a    coolant    sample    to    your Caterpillar  dealer  in  order  to  monitor  the  supplemental coolant  additive  concentration  in  your  engine's  coolant mixture  every  250  service  hours  or  monthly,  whichever comes    first.        Supplemental    coolant    additive    or    a maintenance   additive   element   (if   equipped)   may   be needed  every  250  service  hours  or  monthly,  whichever come first. NOTICE To    prevent    over-inhibiting    the    engine's    cooling system,    do    not    use    both    supplemental    coolant additive  liquid  and  a  supplemental  coolant  additive element  (if  equipped)  at  the  same  time.    Use  one method exclusively. When using Caterpillar Diesel Engine Antifreeze/Coolant and  supplemental  coolant  additive,  the  cooling  system should  be  drained,  cleaned,  flushed,  and  filed  with  new coolant  every  3000  service  hours  or  every  two  years, whichever  come  first.    Refer  to  the  topic  Maintenance Intervals in this manual. When NOT using Caterpillar Diesel Engine Antifreeze/Coolant   and   supplemental   coolant   additive, the   drain/flush   procedure   must   be   performed   at   least every year. After you drain and you refill the cooling system, operate the  engine  with  the  radiator  filler  cap  removed  until  the coolant  reaches  normal  operating  temperature  and  the coolant    level    stabilizes.        Add    coolant    mixture    as necessary to fill the system to the proper level. Cooling System Cleaning Draining,    cleaning,    and    flushing    the    cooling    system removes  small  particles,  undesirable  chemicals,  scale, and other deposit formations. Not performing maintenance    on    the    cooling    system    can    eventually cause  engine  overheating  problems  that  could  result  in severe damage to engine and components. Clean    the    cooling    system    if    the    system    becomes contaminated,  if  the  engine  overheats,  or  if  foaming  is observed. Caterpillar's   Fast   Acting   Cooling   System   Cleaner   is designed   to   clean   the   system   of   harmful   scale   and corrosion.          The     cleaner     dissolves     mineral     scale, corrosion products, light oil contamination, and sludge. Fast  Acting  Cooling  System  Cleaner  is  available  from your Caterpillar dealer in the quantities listed.  Follow the product label directions for proper use. CATERPILLAR FAST ACTING COOLING SYSTEM CLEANER Part Number Size 4C-4609 .47 L (.5 qt) 4C-4610 .95 L (1 qt) 4C-4611 3.8 L (1 US gal) 4C-4612 19 L (5 US gal) 4C-4613 208 L (55 US gal) Maintenance Section Cooling System Specifications 1-31