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Testing antifreeze strength with a hydrometer

Testing antifreeze strength with a hydrometer Use an antifreeze (not a battery) hydrometer Draw in enough coolant to move the float or balls.

Use an antifreeze hydrometer. Suck in coolant from the header tank; if there is a float, take a reading where the float breaks the liquid surface and convert to antifreeze strength on the hydrometer chart. If there are balls, the numbers and colours floating show the strength;check the instructions.

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