C 2500 Suburban 2WD V8-454 7.4L VIN J SFI (1998)
8. Point the coolant concentration tester toward any light source. Look into the eyepiece.
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The coolant protection reading is at the point where the dividing line between light and dark crosses the scale. Antifreeze protection is the
scale on the right.
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The temperature scale is reversed from a standard thermometer scale. Below zero readings are on the upper half of the scale.
9. If the readings are not clear, properly clean and dry the measuring surface. Conduct a new test. Ensure that there is enough fluid on the measuring
surface.