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Taking the Coolant Sample

Take a sample of the coolant with the test tube.
photo by Matt Wright, 2008
To test your coolant mixture, you'll need to take a sample from your radiator or coolant reservoir, whichever's easiest. Be sure to let your engine cool down before you remove your radiator or coolant reservoir cap. Once the engine is cool, open the cap and suck a sample of coolant into the test tube.
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