Coolant Concentration Testing

^ Tools Required:
- J 23688-A or J 26568-A Coolant Tester, Or Equivalent





NOTE
^ Both coolant testers automatically compensate for temperature.
^ Make sure eyepiece of the coolant tester is totally free of solution before looking through it.
^ Before each use, swing plastic cover at slanted end of coolant tester exposing measuring window and bottom of plastic cover.
^ Wipe dry both prism and bottom of sample cover with tissue or clean soft cloth. Close plastic cover.

1. Release tip of pump from coolant testers housing.
^ Do not remove clear plastic pump from coolant testers.

WARNING: As long as there is pressure in the cooling system, the temperature can be considerably higher than the boiling temperature of the solution in radiator without causing the solution to boil. Removal of the radiator cap while engine is hot and pressure is high will cause the solution to boil instantaneously possibly with explosive force spewing the solution over engine, fenders and person removing cap. Under some conditions, the ethylene glycol in engine coolant is combustible.

2. Remove radiator cap.
3. Insert tube into coolant recovery reservoir.
^ Make sure tube is below level of coolant.





4. Press and release bulb to get sample of coolant.
5. Bend tube around coolant testers so that tip can be inserted in cover plate opening.
6. Press bulb and allow a few drops to fall onto measuring surface.
^ Do not open plastic cover when taking readings because water evaporation can change readings.





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.