There are several considerations to determine whether the car antifreeze needs to be replaced:The color of the coolant, the turbidity of the coolant, the pH of the coolant, the cooling performance of the coolant.
First, observe the color of the coolant. Normally, the color of antifreeze should be bright and transparent, usually green, yellow, or orange. If the coolant is cloudy, dark, or sedimentary, it could be a sign that it needs to be replaced.
Second, check the turbidity of the coolant. The use of a transparent container allows for a better view of the turbidity of the coolant. If the coolant becomes cloudy, it may be due to the presence of deposits, air bubbles, or impurities, and it's time to consider replacing the coolant.
Third, measure the pH of the coolant. A professional pH tester can be used to measure the pH of the coolant. In general, the pH of the coolant should be within a certain range, and if the pH is outside the normal range, the coolant needs to be replaced.
Finally, the cooling performance of the coolant is tested. This requires the use of specialized coolant testing instruments to test the cooling performance of the coolant, including the freezing and boiling points of the coolant. If the freezing or boiling point of the coolant is outside the specified range, then the coolant needs to be replaced.
In general, the above aspects are important indicators to judge whether the car antifreeze needs to be replaced. If you notice an abnormality in the coolant in terms of color, turbidity, pH, or cooling performance, you should consider replacing the coolant.