Updated at: 24-03-2022 - By: Lucas

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Is my car going to need more coolant because it’s so hot outside and liquids are evaporating so quickly?

Running out of coolant can lead to overheating, which is bad for the engine, so it is imperative that a vehicle never runs out. In the summer, do cars use more coolant?

The coolant in every car is protected from the sun by a bonnet, which prevents it from evaporating quickly in the heat of the sun.

As a result, a thermostat that opens frequently to allow coolant to pass through could lead to increased coolant consumption if the engine compartment temperature rises as a result of the high impact of the sun and the heat created by the engine.

Do Cars Use More Coolant In The Summer?

Does Coolant Evaporate In Hot Weather

To elaborate on what has been said thus far, driving on a hot summer day will cause your engine to heat up rapidly. The engine’s thermostat valve aids in maintaining a comfortable operating temperature.

At high temperatures, the valve opens and allows coolant reservoir liquid to flow in, while hot steam from the engine escapes and is blown away by a fan as it travels through the valve’s opening onto the radiator.

On hot summer days, the thermostat valve may be more likely to open than on cold winter days, according to research. As a result, the engine must use more coolant to keep its temperature stable and avoid overheating.

Cars are more likely to use more coolant in the summer than they are throughout winter. A 50/50 mix of water and cooling fluid is also recommended by some automotive experts. This suggests that the coolant should account for half of the total volume of the mixture, with the remaining water making up the other half.

Overheating can be avoided by filling your car’s coolant reservoir with this coolant blend, which minimizes the amount of coolant you require.

A 50/50 coolant blend is recommended by some experts, but this is no reason to switch to water in a bid to save coolant.

The anticorrosive ingredient in coolant protects your engine from rotting, whereas water does not. Water may effectively cool your car down far faster than coolant.

Mixing Coolant With Water vs Using Straight Water In Summer

Consider mixing your remaining coolant liquid with water in a 50/50 solution if you’re concerned about spending more on coolant during the summer season. Mixing coolant is fine during the summer, but it’s not a good idea in the winter.

It’s also important to keep coolant liquid at a level that doesn’t surpass the amount of water in the engine compartment. Pre-mixed coolants are available in car shops, in case you don’t want to risk mixing coolant and water incorrectly.

In contrast, it’s quite risky to keep your car’s cooling system topped down with nothing but water. If you do this, you risk destroying the engine, which would be extremely expensive to fix. A new vehicle or a complete engine replacement are both options you may have to consider.

The engine bay components will deteriorate if you use water straight from the tap. Leaving water in a hot atmosphere might hasten its evaporation even further.

If you’re looking to keep your car cool without it evaporating, antifreeze/coolant liquid is what you’re looking for. When the engine gets heated, water will evaporate because it contains no additives.


When it’s hotter outside, do vehicles require more coolant? They do, but not quite as much as you might think. Premixed coolant liquids, on the other hand, are far more affordable. Regardless matter the cause, do not attempt to run on straight water.

In addition, make sure the coolant, oil, and other components of the vehicle are in good working order every morning. Preventing overheating in the summer is made easier with this pre-check. I trust we were able to provide you with the information you sought?