Testing coolant strength
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This document discusses tools for testing coolant strength in a vehicle's cooling system. It describes a hydrometer and refractometer, which measure the concentration of antifreeze compared to water to determine freeze protection. A hydrometer indicates the freeze protection level by where floating balls point on a scale, which should be between 34 degrees F and 265 degrees F. A refractometer measures the refraction of light through the coolant to determine the refractive index and corresponding coolant concentration.
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Testing coolant strength
- 2. Testing Coolant Strength • Measures the concentration of antifreeze compared to water • Determines freeze protection • Tools used: • cooling system hydrometer • refractometer
- 3. Hydrometer • When filled, pointer will float to indicate freeze protection
- 4. Reading the Hydrometer To read the hydrometer, check out the number and colour of floating balls, or where the arrows point on the freeze point scale printed on the hydrometer.
- 5. Reading the Hydrometer Whichever hydrometer type you use, the purpose is to show you the temperature range at which the coolant should work in your vehicle. The hydrometer should indicate a range of 34 degrees Fahrenheit or below to 265 degrees Fahrenheit or higher. Anything that falls in between this means that the coolant system needs flushing.
- 6. How does the refractometer work? When light enters a liquid it changes direction; this is called refraction. Refractometers mea sure the degree to which the light changes direction, called the angle of refraction. A refractometer takes the refraction angles and correlates them to refractive index (nD) values that have been established.
- 9. REFERENCE • Duffy. E. J., (2004) Modern Automotive Technology (6 e.d.). Goodheart-Willcox Co. • Halderman. D. J., (2012) Automotive Technology: Principles, Diagnosis and Service (4th e.d.). Pearson Education, Inc.,