Coolant: Testing and Inspection
COOLANT CONCENTRATIONCoolant concentration should be checked when any additional coolant is added to the cooling system, or after a coolant drain, flush and refill. The coolant mixture offers optimum engine cooling and protection against corrosion when mixed to a freeze point of -37°C (-34°F) to -46°C (-50°F). The use of a hydrometer or a refractometer can be used to test coolant concentration.
A hydrometer will test the amount of glycol in a mixture by measuring the specific gravity of the mixture. The higher the concentration of antifreeze/coolant, the larger the number of balls that will float, and higher the freeze protection.
A Refractometer, Special Tool 8286, will test the amount of antifreeze/coolant in a coolant mixture by measuring the amount a beam of light bends as it passes through the fluid.
CAUTION: Do not mix different types of coolant-corrosion protection will be severely reduced.