What can result from using too much ethylene glycol in coolant?

Using excessive ethylene glycol in coolant can lead to an increased risk of engine corrosion. Ethylene glycol is commonly used in antifreeze formulations due to its properties that lower the freezing point and raise the boiling point of the coolant. However, when the concentration is too high, it can disrupt the balance of the coolant system.

At elevated concentrations, the coolant may become less effective at providing proper heat transfer and can lead to the formation of acidic compounds over time, which promote corrosion. This corrosion can damage critical engine components, including the radiator, water pump, and engine block. Therefore, maintaining the correct mixture of ethylene glycol is essential for protecting the engine from corrosion while optimizing its performance.

The other options are relevant to properties of ethylene glycol but do not address the specific negative consequence of excessive use in the coolant system, which is the increased risk of engine corrosion.