Fig. 2.6. Measuring the specific gravity of coolant using a hydrometer
Measure the specific gravity of the coolant using a hydrometer.
Measure the coolant temperature and determine the concentration of antifreeze taking into account the relationship between specific gravity and temperature based on the data provided tables 2.4.
Example: The safe operating temperature is –15°C when the measured specific gravity is 1.058 g/cm³ at a coolant temperature of 20°C.
Recommended coolant
If the concentration of antifreeze is below 30%, then the anti-corrosion properties of the coolant are significantly reduced.
If the concentration is more than 60%, then the crystallization temperature of the antifreeze increases (the efficiency of heat exchange decreases), which has an adverse effect on the engine. Therefore, make sure that the concentration level of the antifreeze is within the specified range.
Do not mix antifreezes of different types and colors.