Pic. 2.6. Measuring the specific gravity of the coolant with a hydrometer
Measure the specific gravity of the coolant with 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 given 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 antifreeze rises (heat exchange efficiency decreases), adversely affecting the engine. Therefore, make sure that the antifreeze concentration level is within the specified range.
Do not mix antifreezes of different types and colors.