How to test antifreeze strength CORRECTLY

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Make sure to check your antifreeze strength before the winter.
In case it is not strong enough, it is possible that your engine may get damaged because of the coolant freezing and then cracking the engine.
The test is really easy and quick. The tester is very cheap also.
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No fluff, no guff. Just the info! Great, thanks!!

normajdennis
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I usually flush my tester with water before storing as well, just to keep it clean.

GearheadStew
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I always wondered how to do that . Know i know!

mygiguser
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You're checking the strength in the reservoir only. You should really check it in the radiator because coolant is not circulated through the reservoir. You could have 75% antifreeze in the reservoir and straight water in the cooling system.

keithsada
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You didn't explain if the -40F temp. reading is good or bad

fantomboo
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What color is antifreeze? My color is a dark brown. Is that right ?

douglasharrislane