COOLING SYSTEMHydrometersHydrometers (Figure 5) are used to test the freezingprotection of an anti-freeze solution and work on theprinciple of specific gravity or weight of the anti-freezesolution. They are simple to use, If used in the propermanner. When using the hydrometer, the solution mustbe at least 44°C (110F). The temperature and levelmust be noted correctly and the float must be able tomove freely. Read only the hydrometer scalecorresponding to the type anti-freeze solution in theradiator. Keep hydrometer clean inside and out and treatit with the same care as given any other precisioninstrument.Figure 5. - Using Hydrometer to Test Anti-freezeSolutionSE-2384 Pressure TesterThis tester (Figure 6) consists of a heavy duty pumpcomplete with adapters for remotely applying pressure tothe cooling system at the radiator fill neck. The pump isequipped with a pressure gauge, manual pressure reliefvalve and hose assembly, with twist-on clamp bracket toreceive the adapters. The adapters can be quicklyattached together for a small or large filler neck eitherwith a shallow or deep neck.Figure 6. - SE-2384 Cooling System Pressure TesterSE-2395 Anti-Freeze and Battery TesterThis tester (Figure 7) is designed for quick and accuratechecking of anti-freeze protection and battery specificgravity readings. Coolant may be checked hot or coldwith a minimum amount of coolant or battery acidrequired. Operating instructions are included with theFigure 7. - SE-2395 Anti-Freeze and Battery TesterTROUBLESHOOTINGCAUSES OF COOLANT LOSSLeaks and SeepageMay be either external or internal.External leaks easy to locate, may occur at radiator,heater, water pump, core plug hole, hose connections,radiator cap, drain cocks and gaskets.Internal leaks are more difficult to locate since theseleaks occur at cracks and faulty head gaskets. Internalleaks are indicated by a decrease in coolant level andthe presence of coolant in crankcase.CTS-4181Page 10
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