Is there any impact if the car coolant exceeds the max level?

[LeLeah]

There is no impact if the car coolant exceeds the max level. Adding too much coolant to the vehicle has no significant effect. During vehicle operation, the excess coolant will expand due to heat and overflow through the pressure relief valve, which is not harmful but may leave some stains. It is recommended to use a syringe to remove the excess. Generally, the coolant reservoir will have a max water level mark and a min water level mark. The coolant should be filled between the max and min levels. Coolant should be added when the car is stationary, as adding it at high temperatures may result in inaccurate water level readings. It is advisable to use high-quality coolant that matches the original color of the vehicle or a universal type. Do not mix coolants of different brands or colors, as their formulations may differ and could cause chemical reactions, affecting the coolant's performance.