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Coolant sample on refractometer 2. Using a pipette, take a sample from the coolant expansion tank. Sprinkle a few drops on the test surface of the refractometer. Closed refractometer lens 3. Close the light-diffusing lens. A closed film of liquid must form. Note The following table specifies how much coolant must be replaced by pure coolant in order to adjust • 4. Hold the refractometer against a bright light source. A clear light/dark limit emerges. The point of intersection between this line and the display scale marks the freezing point of the coolant. A freezing Measured antifreeze content Pure antifreeze quantity to be added (in - 5 9 - 10 8,5 - 15 7,5 - 20 7,0 - 25 5,0 - 30 3,5 - 35 1,5 Diagnostic system: reading out fault memory and activating systems Checking the antifreeze content using a refractometer 545 |