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Can Coolant Evaporate When It's Hot Outside?

As the summer sun beats down, temperatures soar, and the asphalt radiates heat, your car's cooling system becomes an unsung hero, keeping the engine at the right operating temperature. But have you ever wondered if coolant can evaporate under the scorching summer heat? Let's unveil the mystery of coolant evaporation and explore what you can do to ensure your vehicle stays cool even in the hottest weather.

  Before We Start: What Does The Coolant Do?

Before we dive into the question of evaporation, let's briefly understand the role of coolant in your vehicle's cooling system. Coolant, a mixture of antifreeze and water, plays a crucial role in maintaining the engine's temperature. It absorbs heat generated during combustion and transfers it away from the engine to prevent overheating.

  The Evaporation Dilemma

Given that coolant contains water, you might be curious about whether it can evaporate in hot weather. The answer is yes; coolant can indeed evaporate, especially in extreme heat conditions. As the external temperature rises, the liquid coolant may gradually evaporate, leading to a decrease in its volume and potentially affecting the cooling system's efficiency.

Several factors contribute to the evaporation of coolant:

  • High Temperatures: When the outside temperature is scorching, the heat can cause the coolant to evaporate at a faster rate.
  • Leaks: Coolant leaks in the cooling system can also lead to a reduction in the coolant level, even in cooler weather.
  • Defective Radiator Cap: A faulty radiator cap can allow excess pressure to build up, leading to coolant loss through evaporation.
  • Inadequate Coolant Mixture: Using an improper coolant-to-water ratio can lead to quicker evaporation, as well as reduced freezing and boiling protection.

  Preventing Coolant Evaporation

While some coolant evaporation is normal, there are measures you can take to minimize its impact:

Regularly Inspect and Maintain the Cooling System
Periodically check for coolant leaks, ensure the radiator cap is functioning correctly, and inspect the hoses for any signs of wear or damage.

Use the Right Coolant Mixture
Ensure you use the correct coolant-to-water ratio recommended by your vehicle's manufacturer. This helps maintain the coolant's properties and efficiency.

Park in the Shade
Whenever possible, park your car in shaded areas to reduce the impact of direct sunlight on the cooling system.

Keep Your Cooling System Topped Up
Regularly check the coolant level and top it up if needed. Consult your vehicle's owner's manual for the appropriate coolant type and capacity.


Coolant is as important during the summer season as it is in every other one. If your engine is overheating, misfiring, or having cooling problems in general, make sure to visit us at KAMS Auto Service Center! We will take care of your vehicle and resolve any current problems.

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