What Causes the Engine to Make a Gurgling Sound Like Boiling Water?

[LeilaniMarie]

This phenomenon in the engine is related to the coolant. Insufficient coolant or the use of low-quality coolant are key factors. This issue is more common in summer and is often referred to as "boiling over," which can affect the vehicle's performance and lifespan. When this occurs, you can turn on the car's heater and set the temperature to the highest level, then turn it off after a few minutes. Below are some relevant explanations: 1. Boiling Point of Antifreeze: Different manufacturers produce antifreeze with varying freezing and boiling points. Generally, the boiling point of modern antifreeze should exceed 105°C. If high-quality antifreeze is used, the "boiling over" phenomenon will not occur. 2. Key Indicators for Evaluating Antifreeze Quality: (1) Freezing Point: Water freezes at 0°C, while standard antifreeze can typically reach -40°C. High-quality antifreeze should achieve around -60°C, which is an important benchmark for assessing antifreeze quality. (2) Boiling Point: Water boils at 100°C, whereas antifreeze should have a boiling point of at least 108°C. In other words, the lower the freezing point and the higher the boiling point, the greater the temperature range, indicating better antifreeze quality.