10Prestone TSB for Training130009252017

Technical Service Bulletin Page 4 PCTSB-2017-01 PRESTONE PRODUCTS CORPORATION 1900 West Field Court, Lake Forest, IL 60045 ©2017 Prestone Products Corporation Conversion from an IAT type HD coolant to Prestone Command ® HD NF Extended Life Antifreeze/Coolant: (Never open a hot cooling system, wait for the cooling system to cool down before opening) This conversion may be done any time, at the fleet’s discretion. Remove any SCA release filters first and completely flush the cooling system with water two to three times to remove the IAT type coolant. If the cooling system shows signs of contamination utilize Prestone Command ® Heavy Duty Cooling System 2in1 Flush & Degreaser during the process and flush the cooling system with water to remove the chemical flush cleaner and contaminates. It is preferred (if equipped) to unscrew and remove all of the engine cooling system drain plugs (including block drains) to completely drain all flush water from the cooling system. An engine could hold, up to, 15% - 25% of contaminated coolant or flush water. The next few pages describe recommended testing procedures to determine if the cooling system needs maintenance or if a conversion is recommended from an IAT type coolant to Prestone Command ® HD NF Extended Life Antifreeze/Coolant. HD Coolant Conversion Notes: Recommended HD Coolant Test Equipment, Water Analysis & HD Coolant Test Strips AFC200 Refractometer Accurately test Freeze Point & DEF Concentration Part# AFC220 HD IAT Coolant Test Strips Measures: Nitrite, % Glycol, & pH Part# AFC240 HD OAT ELC Coolant Test Strips Measures: % Glycol, % OAT Inhibitor, Nitrite, & pH Part# AFC210 Water Quality Test Strips Measures: Hardness, pH & Chloride