COOLING SYSTEM
Hydrometers
Hydrometers (Figure 5) are used to test the freezing
protection of an anti-freeze solution and work on the
principle of specific gravity or weight of the anti-freeze
solution. They are simple to use, If used in the proper
manner. When using the hydrometer, the solution must
be at least 44°C (110F). The temperature and level
must be noted correctly and the float must be able to
move freely. Read only the hydrometer scale
corresponding to the type anti-freeze solution in the
radiator. Keep hydrometer clean inside and out and treat
it with the same care as given any other precision
instrument.
Figure 5. - Using Hydrometer to Test Anti-freeze
Solution
SE-2384 Pressure Tester
This tester (Figure 6) consists of a heavy duty pump
complete with adapters for remotely applying pressure to
the cooling system at the radiator fill neck. The pump is
equipped with a pressure gauge, manual pressure relief
valve and hose assembly, with twist-on clamp bracket to
receive the adapters. The adapters can be quickly
attached together for a small or large filler neck either
with a shallow or deep neck.
Figure 6. - SE-2384 Cooling System Pressure Tester
SE-2395 Anti-Freeze and Battery Tester
This tester (Figure 7) is designed for quick and accurate
checking of anti-freeze protection and battery specific
gravity readings. Coolant may be checked hot or cold
with a minimum amount of coolant or battery acid
required. Operating instructions are included with the
Figure 7. - SE-2395 Anti-Freeze and Battery Tester
TROUBLESHOOTING
CAUSES OF COOLANT LOSS
Leaks and Seepage
May 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 these
leaks occur at cracks and faulty head gaskets. Internal
leaks are indicated by a decrease in coolant level and
the presence of coolant in crankcase.
CTS-4181
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