LO 11-8 Outline maintenance procedures and identify tools and methods used to perform maintenance on a diesel engine cooling system

SKILL DRILL 11-5  Using a Hydrometer to Test the Freeze Point of Coolant

STEP 1
Remove the pressure cap. Be sure the cooling system is cool before removing the cap.

STEP 2
Determine the type of antifreeze and verify that the hydrometer is designed to be used with it.

STEP 3
Place the hydrometer tube into the coolant and squeeze the ball on the top of the tool.

STEP 4
Release the ball to draw in a sample of coolant. Make sure the level of coolant drawn in is above the minimum line.

STEP 5
Read the scale on the tool to verify the freeze protection of the coolant.

STEP 6
Return the coolant sample to the radiator or surge tank.

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