Portuguese 
Spanish 
Placing a flag on the car hood does not increase engine temperature, but can cause serious problems if not properly secured.
The main risk of using a flag on the hood of the car during Brazilian National Team games is not the increase in engine temperature. The danger arises when the fabric is secured in an improvised manner and may come loose with the vehicle’s movement, covering the windshield or hitting other people on the road.
This assessment is from engine specialist Erwin Franieck, advisor to SAE Brasil for MobiAuto. According to him, covering the external part of the hood does not compromise the cooling system, because the engine’s heat is not dissipated through this panel.
Fans should therefore focus on securing the accessory, especially when the car is traveling at higher speeds.
-
How to Identify and Remove Superficial Scratches Before Spending on Car Bodywork
-
Electric Car with Extended Range: Company Patents Hybrid Transmission System Using Gasoline Engine for Backup
-
GM Developed the Chevette to Rival the Beetle, Launched it in Brazil Before Europe, Sold 1.6 Million Units, and Left a Generation with Gas Station Trauma
-
Caoa Changan CS75: New Model with 1.5 Turbo Flex Engine and 8-Speed Automatic Priced $4,000 Less in Brazil
Does a flag on the car hood interfere with cooling?
Despite covering a large area over the engine compartment, a flag on the car hood does not prevent the vehicle from controlling its temperature.
Cooling depends on the radiator, the liquid responsible for thermal exchange, and the airflow entering through the front of the vehicle. This system is designed to remove excess heat produced during engine operation.
The hood panel does not perform this function. Therefore, placing a fabric on its external surface does not force the engine to operate at higher temperatures. According to Franieck, the vehicle’s thermal system is optimized by the frontal airflow, not by heat release through the hood.
The car’s construction itself reinforces that the panel is not used as a primary area for thermal dissipation.
The hood usually receives a thermal and acoustic mat. This material helps retain some heat within the compartment and also reduces the amount of noise transmitted outside the vehicle.
This means the hood acts more as an insulation element than as a component responsible for cooling the engine. For this reason, an external application, such as the flag used by fans, does not directly interfere with the radiator’s operation or the circulation of the cooling liquid.
Improvised securing can block the driver’s view
Although it does not cause overheating, the flag on the car hood requires attention before the vehicle starts moving. A weak fastening can give way to the force of the wind. If the fabric partially comes loose, there is a risk of it moving over the windshield and reducing or blocking the driver’s view.
The problem can occur suddenly, leaving little time to react and compromising control of the vehicle. Franieck highlights that there are safer ways to customize the car, such as professional wrapping and securing systems capable of keeping the accessory stable during travel.
The risk is mainly in improvised solutions, which do not offer sufficient resistance to air movement.
Low speed reduces risk, but does not eliminate precautions
In urban routes carried out between 30 and 40 km/h, the risk is considered practically nil when the flag is correctly installed.
The lower speed reduces the wind pressure on the fabric and decreases the possibility of detachment. Even so, the driver should check if the ends are firm and if no part can reach the windshield.
It is also necessary to observe if the installation interferes with other areas of the vehicle or visibility while driving. Before leaving, the driver should test the stability of the flag on the car hood and avoid materials or fastenings that can easily give way.
On highways, the situation changes because the higher speed increases the force exerted by the air on any object installed on the outside of the vehicle. A poorly secured flag can detach, hit another vehicle, or surprise motorcyclists and other road users.
The warning is not limited to fabrics covering the hood. Even small flags placed on windows can escape their fastening and become dangerous objects.
Therefore, an installation that seems safe in urban traffic may not withstand the conditions found on a highway. Those intending to travel with a decorated car should pay extra attention and avoid taking accessories on the road whose stability cannot be guaranteed.
How to use the flag on the car more safely?
The fan can decorate the vehicle without worrying about the engine temperature, as long as they focus on the installation.
The flag on the car hood needs to remain firm even with movement and cannot have loose parts capable of reaching the windshield. Improvised fastenings should be avoided, especially when the route includes fast lanes.
Professional solutions, such as vehicle-specific adhesives, reduce the possibility of the material coming loose. Stable fastening systems can also be used when they prevent the fabric from moving freely.
Checking should be done before each trip, especially after periods of use or exposure to wind.
Engine is not the problem; safety must come first
Spreading the flag over the car remains a way to show support for the Brazilian National Team. From a cooling perspective, the practice does not harm the vehicle’s operation nor increase the engine temperature.
The radiator, coolant, and front air intake remain responsible for thermal control, regardless of the flag’s presence on the hood. Before getting into the game spirit, fans should ensure that the decoration is as secure as the rest of the vehicle.
Source: MobiAuto
