What are the effects of overfilling the coolant in a car?

[VanessaAnn]

Overfilling the car coolant can cause it to expand due to heat during operation, leading to overflow through the pressure relief valve and leaving stains. The function of car coolant is to prevent the freezing of the liquid in cold winter, which could otherwise crack the radiator or damage the engine cylinder or head. The method for replacing coolant is as follows: Unscrew the radiator cap to drain the coolant; Run the engine at idle and inject clean water until the water coming out of the radiator is clear; Wait for the clean water to drain completely and then close the water valve; Fill with new coolant until the liquid level is between the max and min marks; 5. Close the cap and let the engine idle for two to three minutes. Precautions for using car coolant include: Try to use the same brand of coolant; Ensure the product is within its validity period when adding; Avoid diluting it with water; A large amount of particle sedimentation indicates that the coolant has deteriorated and should no longer be used.