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Chapter 4 35943
Page 16
How to check the specific gravity of the coolant
For mixtures which contain inhibited ethylene glycol:
1. Operate the engine until it is warm enough to open the thermostat. Continue to run the engine until the
coolant has circulated through the cooling system.
2. Stop the engine.
3. Allow the engine to cool until the temperature of the coolant is below 140 °F (60 °C).
Warning! Do not drain the coolant while the engine is still hot and the system is under pressure because
dangerous hot coolant can be discharged.
4. Remove the filler cap of the cooling system.
5. Drain some coolant from the cooling system into a suitable container.
6. Use a special coolant hydrometer that will check the temperature and the specific gravity of the coolant,
follow the manufacturer’s instructions.
Note: If a special coolant hydrometer is not available, put a hydrometer and a separate thermometer into the
coolant mixture and check the readings on both instruments. Compare the readings with the chart (A).
7. Adjust the strength of the mixture as necessary.
Note: If it is necessary to fill or replenish the coolant system in service, mix the coolant to the correct
strength before it is added to the coolant system.
A coolant to water ratio of 50:50 should be used even in warm ambient temperatures, in order to maintain the
concentration of the corrosion inhibitor in the coolant.
Specific gravity chart
A = Percentage coolant by volume
B = Mixture temperature in Fahrenheit
C
= Specific gravity
D
= Mixture temperature in Celsius.