159594-4722 ZEXEL 9 443 611 976 BOSCH ACTUATOR 9443611976 1595944722

Recommended Coolant Mixture (Maintenance)
Monitor the coolant condition to determine it's proper life. Adding pure antifreeze as a makeup solution for cooling system top-off is an unacceptable practice. It increases the concentration of antifreeze in the cooling system which increases the concentration of dissolved solids and undissolved chemicals in the cooling system. Add antifreeze premixed with acceptable water to the same freeze protection as your cooling system. Use the chart below to assist in determining the concentration of antifreeze to use. Check the coolant solution frequently in cold weather for glycol concentration with the Caterpillar Coolant Tester to ensure adequate freeze protection. There are two testers available. Both testers are identical except temperature scale (one °C; one °F) and give immediate results for antifreeze/coolants that contain ethylene or propylene glycol. Both are available from Caterpillar.Commercial Antifreeze/Water Coolant Mixture
If propylene glycol based antifreeze is used, DO NOT allow concentration greater than a 50/50 antifreeze to water mixture. The measurement of freeze protection must be made with a refractive-type tester rather than a hydrometer-type (which can be used to test ethylene glycol based antifreeze). Use the concentration chart above for proper freeze protection.Liquid supplemental coolant additive must be added, when not using Caterpillar Antifreeze, which contains the proper additive.
Most commercial antifreezes are formulated for gasoline engine applications and will, therefore, have high silicate content. ASTM D4985-89 antifreeze is a low silicate antifreeze and should be used if not using Caterpillar Antifreeze. The percentage of antifreeze and water should be determined by the amount of freeze protection required. Follow the instructions provided by the antifreeze supplier.When using any antifreeze (except Caterpillar Antifreeze) liquid supplemental coolant additive is required at initial fill. Caterpillar or other manufacturer's products can be used as the liquid supplemental coolant additive.Add 2 liter (2 U.S. quart) of liquid supplemental coolant additive, or equivalent, for each 30 liter (8 U.S. gallon) so that the cooling system will have a 3% to 6% concentration of liquid supplemental coolant additive.DO NOT mix Caterpillar liquid Supplemental Coolant Additive (Conditioner) with the other products available; select a cooling system treatment and use it exclusively. If other than Caterpillar products are used as the liquid supplemental coolant additive, follow the manufacturers' recommendation for cooling system treatment and test evaluation.Liquid Supplemental Coolant Additive (Conditioner)
Never use antifreeze/water coolant only, except if Caterpillar Antifreeze is being used. No liquid supplemental coolant additive is needed on initial fill, but is necessary on a maintenance basis.Excessive liquid supplemental coolant additive greater than the maximum recommended 6%, together with concentrations of antifreeze greater than 60% can cause deposits to form and can result in radiator tube blockage, overheating, and/or water pump seal damage.
Caterpillar requires the use of Caterpillar liquid Supplemental Coolant Additive (Conditioner). Caterpillar Antifreeze does NOT require liquid supplemental coolant additive at initial fill, but IS necessary on a maintenance basis.Liquid supplemental coolant additive (conditioner) is necessary to prevent rust, scale, pitting and/or corrosion of engine parts that coolant comes in contact with. A 3 to 6 percent concentration