Making the Correct Antifreeze Mixtures

TM 9-2320-312-24-2

Testing and Adjusting Section

Making the Correct Antifreeze

Mixtures

Adding pure antifreeze as a makeup solution for

the cooling system top-off is an unacceptable

practice. Adding pure antifreeze increases the

concentration of antifreeze in the cooling system.

This increases the concentration of the dissolved

solids and the undissolved chemical inhibitors

in the cooling system. Add the antifreeze and

water mixture to the same freeze protection as

your cooling system. The following chart assists

in determining the concentration of antifreeze to

use. Refer to Operation and Maintenance Manual,

"General Coolant Information".

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Illustration 73

9S-8140 Pressurizing Pump

Table 19

Antifreeze Concentrations

The 9S-8140 Pressurizing Pump is used to test the

filler caps. This pressurizing pump is also used to

Temperature

Concentration

pressure test the cooling system for leaks.

30% antifreeze and

Protection to -15 C (5 F)

70% water

Protection to -23 C

40% antifreeze and

(-10 F)

60% water

Protection to -37 C

50% antifreeze and

(-34 F)

50% water

Protection to -51 C

60% antifreeze and

(-60 F)

40% water

Checking the Filler Cap

Table 20

Tools Needed

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Illustration 74

Part

1U-7297 Coolant/Battery Tester or 1U-7298 Coolant/Battery

Part Name

Quantity

Number

Tester

9S-8140

Pressurizing Pump

Check the coolant frequently in cold weather for

the proper glycol concentration. Use either the

One cause for a pressure loss in the cooling system

1U-7297 Coolant/Battery Tester or the 1U-7298

can be a damaged seal on the radiator filler cap.

Coolant/Battery Tester in order to ensure adequate

freeze protection. The testers are identical except

for the temperature scale. The testers give

immediate, accurate readings. The testers can be

used for antifreeze/coolants that contain ethylene

or propylene glycol.