G 2500 3/4 Ton Van V8-305 5.0L VIN M SFI (1997)
7. Point the coolant testers toward any light source and look into eyepiece.
^
Coolant protection reading is at point where dividing line between light and dark crosses scale on right.
^
Temperature scale is reversed from a standard thermometer scale. Below zero readings are on upper half of scale.
^
If readings are not clear, the measuring prism was not cleaned and dried or there was not enough fluid on the measuring prism.
Calibrating Testers
The coolant testers are factory calibrated and sealed and should not require adjustment. If adjustment is required, follow instructions below.
1. Make sure the coolant testers is between 21 and 29°C (70 and 85°F).
2. Using distilled water, take a reading. If reading departs from a 0°C (32°F) reading on scale, a correction can be made by adjusting screw on
bottom of the coolant testers.
3. Remove sealant covering screw.
NOTE: Do not remove screw from the coolant testers.
4. Turn screw in direction necessary to adjust reading to 0°C (32°F) line.
5. Reseal the screw using a silicone sealant.
