49.32. Which type of internal combustion engine cooling system is the most common?
UAЯкий тип системи охолодження двигуна внутрішнього згоряння найбільш поширений?
Question without image
This exam question from the Traffic Rules of Ukraine concerns the technical condition of the vehicle and the safe operation of the car. Stable engine performance directly affects the reliability of the vehicle in motion: overheating can lead to power loss, stopping in traffic, damage to components, and, as a result, to emergency situations. Therefore, the theoretical exam checks basic knowledge of vehicle construction, in particular, understanding which cooling systems are most commonly used in modern vehicles.
In terms of content, this question relates to the topic of traffic rules regarding the driver's duties to check the technical condition of the car before departure and during operation, specifically to clause 2.3 of the Traffic Rules (checking serviceability and completeness). Although the Traffic Rules do not have a separate classification of cooling systems, knowledge about common solutions helps to properly assess the condition of the car: the level of coolant, the operation of the fan, signs of leaks, temperature indicators, and the risk of overheating.
The open type refers to simpler systems, which are more often found in outdated or specialized designs and provide less stable thermal regulation due to fluid losses and dependence on external conditions. In contrast, the closed type is the most common in passenger and commercial vehicles: the coolant circulates in a closed loop, pressure and controlled temperature are maintained (radiator, thermostat, expansion tank), and antifreeze can be used, which reduces the risk of overheating, corrosion, and problems in winter. In practice, this means that a driver, fulfilling the requirements of the Traffic Rules of Ukraine, must be able to monitor exactly this type of system, as it is most often installed in vehicles and critically affects road safety.
Clause 2.3 (driver's duties regarding the technical condition of the vehicle)
To ensure road safety, the driver is obliged to: a) before departure, check and ensure the technical serviceability and completeness of the vehicle, as well as the correct placement and securing of the load.
This exam question does not directly test a specific traffic rule provision regarding “types of cooling systems” (there are no such definitions/classifications in the Traffic Rules of Ukraine), but it relates to checking knowledge of the structure and technical operation of vehicles in the context of the driver’s duty to ensure the technical serviceability of the car before starting to drive and during operation, in particular the serviceability of the cooling system (preventing overheating, monitoring the coolant level, etc.).
Therefore, the correct answer is “Closed type.”, given that according to the Traffic Rules, the driver is obliged to ensure the technical serviceability of the vehicle before departure (clause 2.3), and the most common in use is the closed-type liquid cooling system, the condition of which the driver must monitor.
During engine operation, its components become very hot, so the cooling system must constantly remove excess heat and keep the temperature within working limits. Various solutions are used in cars for this purpose, but in modern technology, not only simplicity is important, but also the stability of the temperature regime under any driving conditions.
Most often, passenger and commercial vehicles use a liquid cooling system, which operates on the principle of a closed circuit. The coolant circulates inside the system through the engine cooling jacket and radiator, and its volume and pressure are controlled by elements such as the thermostat and expansion tank. Thanks to this, the engine reaches operating temperature faster and does not overheat under load, for example, in traffic jams or when driving uphill.
The closed type is common because the liquid does not come into direct contact with the environment and is not lost through constant evaporation. This allows for stable temperature maintenance, reduces the risk of overheating, and ensures better efficiency and engine life. Also, antifreeze or coolant is normally used in such a system, which is important for operation in winter and for protecting components from corrosion.
Open (mainly air) systems are structurally simpler, but maintain the optimal thermal regime less effectively, are more dependent on external conditions, may be accompanied by higher noise, and provide less favorable conditions for engine efficiency and longevity. Therefore, they are much less common in modern cars.
Thus, the correct answer is "Closed type," since the most common cooling system operates in a closed circuit, ensures stable operating temperature without fluid loss, and better protects the engine from overheating and wear.