Loosen the radiator cap to prevent any pressure buildup
in the top tank.
Warning: Wait until the temperature is below 50°C
[120°F] before loosening the coolant system pressure
cap. Failure to do so can cause personal injury from
heated coolant spray.
Start the engine.
Open the needle valve between 1/16 and 1/4 turn and
look for bubbles in the sightglass. Presence of bubbles
indicates air or combustion gases in the cooling system.
NOTE: Use the needle valve to control the coolant flow
through the sightglass. Restricting the flow permits easier
detection of air bubbles.
If no air is found in the system, do the following:
• Remove the test equipment.
• Check the coolant level and fill if necessary.
• Install the radiator pressure cap.
• Operate the engine until it reaches a temperature of
82°C [180°F], and check for coolant leaks.
Section 1 - Cooling System Cooling System - Testing For Air Or Combustion Gases (1-10)
N14 Page 1-27
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