TM 5-3895-383-24 Cleaning the Heavy-Duty Cooling System Caterpillar Cooling System Cleaners are designed to clean the system of harmful scale and of corrosion.  Caterpillar Cleaners dissolve mineral scale, corrosion products, light oil contamination,   and   sludge.      For   the   recommended   service interval,   refer   to   the   Operation   and   Maintenance   Manual "Maintenance Interval Schedule" for your machine. Conventional Coolant/Antifreeze Cooling System Maintenance SMCS Code:  1350; 1352; 1395 When you initially fill the cooling system with Caterpillar Diesel Engine    Antifreeze/Coolant,    it    is    not    necessary    to    add   a Supplemental   Coolant   Additive.      Caterpillar   Diesel   Engine Antifreeze/Coolant    already    contains    supplemental    coolant additive.      When   you   initially   fill   the   cooling   system   with   a commercial   coolant   that   meets   the   requirements   of   "ASTM D4985", add a supplemental coolant additive. The supplemental   coolant   additive   in   Caterpillar   Diesel   Engine Antifreeze/Coolant    and    in    commercial    coolants    must    be replenished  at  regular  service  intervals.    See  the  table  for Supplemental Coolant Additive (SCA) in order to determine the correct quantity of liquid supplemental coolant additive to use. S· O·S Coolant Analysis SMCS Code:  1350; 1352; 1395; 7542 Testing   the   engine   coolant   is   important   to   ensure   that   the engine is protected from internal cavitation and from corrosion. The analysis also tests the ability of the coolant to protect the engine  from  boiling  and  from  freezing.    The  SOS  Coolant Analysis  can  be  done  at  your  Caterpillar  dealer.    Caterpillar SOS   Coolant   Analysis   is   the   best   way   to   monitor   the condition  of  your  coolant  and  your  cooling  system.    SOS Coolant   Analysis   is   a   program   that   is   based   on   periodic samples. NOTICE Do    not    use    the    same    vacuum    sampling    pump    for extracting oil samples that is used for extracting coolant samples. A  small  residue  of  either  type  sample  may  remain  in  the pump  and  may  cause  a  false  positive  analysis  for  the sample being taken. Always  use  a  designated  pump  for  oil  sampling  and  a designated pump for coolant sampling. Failure  to  do  so  may  cause  a  false  analysis  which  could lead to customer and dealer concerns. New Systems, Refilled Systems, and Converted Systems Perform a coolant analysis (Level 2) at 500 service hours for new  systems  or  for  converted  systems  that  use  ELC  or  use DEAC.    This  500  hour  check  will  also  check  for  any  residual cleaner that may have contaminated the system. Recommended Interval for S· O· S Coolant Sample Table 21 Recommended Interval Type of Coolant Level 1 Level 2 DEAC Every 250 Hours Yearly ELC Not Required Yearly S· O·S Coolant Analysis (Level 1) A  coolant  analysis  (Level  1)  is  a  test  of  the  properties  of  the coolant. The following properties of the coolant are tested: Glycol Concentration for freeze protection Ability to protect from erosion and corrosion pH Conductivity Water hardness Visual analysis Odor analysis The  results  are  reported,  and  appropriate  recommendations are made. Maintenance Section Cooling System Specifications 1-30