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B. Radiator Cap
(1) General
A pressure valve is built into the radiator cap. It is designed to open at a pressure of
approximately seven pounds per square inch.
(2) Removal
WARNING ! Hot steam and fluids will severely burn! When removing cap
from a very hot radiator, do not turn cap past safety stop until all pressure or
steam has escaped. Use protective clothing. Allow engine to cool before
adding coolant.
To remove, turn the cap to the left (counterclockwise) to the safety stop. When all pressure is
released, press down on the cap and continue to turn until the cap is free to be removed.
(3) Installation
When installing the cap be sure it is turned clockwise as far as it will go so that the pressure
retaining valve will be functional.
C. Warm Weather Operation
During warm weather operation, if water is used in the cooling system instead of an antifreeze
solution, keep the cooling system free of rust and sludge by adding a cooling system conditioner that
is compatible with aluminum. Instructions for use of the conditioner are printed on each can.
Caution: Use only a corrosion inhibitor that is compatible with aluminum. Do
not use inhibitors labeled as "acid neutralizer".
D. Cold Weather Operation
(1) General
A permanent type, (Ethylene Glycol) antifreeze is recommended for use in the cooling system.
Caution: (a) Do not use "methanol" or alcohol as an antifreeze.
(b) Do not use two different types of antifreeze. Mixed solutions (two types)
make it impossible to determine if the cooling system has adequate
protection against freezing.
(2) Checking coolant solution
Check the solution frequently to be sure the cooling system has sufficient protection against
freezing.
NOTE: (a) When testing the solution, be sure the coolant is at operating temperature.
(b) Follow manufacturer's instructions on tester.
November 18/91 Revised
OM-2031
2-1
Page 7
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