How To Check And Test Your Antifreeze Coolant Youtube Test the coolant. set your multimeter to dc volts to less than (<) 20 volts. touch the black lead to the negative battery lead or the chassis ground, and place the red lead into the coolant. if the reading is less than .4 volts, the coolant is in good shape. anything over that indicates the anti corrosive properties of the antifreeze have. How to know when you need to change or flush your coolant. do you need new antifreeze or a radiator flush? learn 4 different methods to test your coolant inc.
How To Check Your Antifreeze Strength Insert the tubular end of your hydrometer into the coolant. squeeze the rubber bulb, filling the transparent plastic body of the hydrometer with coolant. examine the floating indicator inside. it will point at a certain number printed on the tool based on the coolant’s density. How to test coolant. begin with a cold engine. remove the radiator cap and start the engine. set your digital multimeter to dc volts at 20 volts or less. when the engine reaches operating temperature, insert the positive probe directly into the coolant. rev the engine to 2,000 rpm and place the negative probe on the negative battery terminal. Squeeze the bulb of your antifreeze testing tool. this will create a vacuum inside the tester that will suck coolant into the chamber, providing a sample of your vehicle’s coolant to test. 6. stop filling the tester when the amount of liquid fills up to the top of the temperature measurements on the tool. 7. Learn how to test your antifreeze, and how to change your coolant to make sure it is protecting your car's engine and cooling system properly. in this video.
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