At the 2023 Las Vegas Grand Prix, ambient temperatures dropped to 10°C, and suddenly teams that had optimised their cooling for 35°C conditions found themselves with engines running too cold, brakes lacking bite, and tyre temperatures falling outside the working window. In Formula 1, cooling is not just about preventing overheating. It is a constant balancing act between thermal management, aerodynamic efficiency, and performance — and the wrong balance can turn a front-running car into a midfield runner in a single session.
The Heat Sources That Teams Must Manage
An F1 car generates heat from multiple sources, each requiring different management strategies. The power unit — the internal combustion engine and the hybrid systems — produces the most heat. The 1.6-litre V6 turbo engine operates at temperatures exceeding 1100°C in the combustion chamber, while the turbocharger spins at up to 150,000 rpm and generates enormous heat from exhaust gases that can reach 1000°C.
The energy recovery systems add their own thermal challenges. The MGU-K harvests kinetic energy under braking and generates heat during deployment. The MGU-H harvests energy from the turbo and operates at extreme temperatures due to its proximity to the exhaust. The battery pack, which stores the recovered energy, must remain within a narrow temperature window — typically between 20°C and 40°C — to maintain performance and prevent degradation.
Brakes contribute significant heat as well. Carbon brake discs operate optimally between 400°C and 800°C but can exceed 1000°C during heavy braking zones. This heat radiates to the surrounding components, including the tyres, which is why brake cooling directly affects tyre management. The hydraulic system, which powers the gearbox and other actuators, also requires cooling to maintain fluid viscosity and prevent seal failure.
How Radiator Design Balances Cooling and Drag
The primary cooling mechanism in an F1 car is the radiator system. Water and oil radiators are housed within the sidepods, and their design represents one of the most critical aerodynamic compromises on the car. Larger radiators provide more cooling but create more aerodynamic drag. Smaller radiators reduce drag but risk overheating the power unit.
Teams use computational fluid dynamics (CFD) to optimise the airflow through the radiators. The goal is to maximise the heat exchange efficiency while minimising the disruption to the car's aerodynamic profile. This has led to innovations like the "zero-pod" design concept, where teams minimise the sidepod volume to reduce drag, relying on alternative cooling solutions to manage the heat.
The radiator inlet size and position are regulated by the FIA, but teams have significant freedom in how they duct the air through the cooling system. Some teams use a narrow inlet with a long duct to accelerate the air and improve heat transfer. Others use a wider inlet with a shorter duct to provide more cooling at the cost of aerodynamic efficiency.
The 2026 regulations, with their emphasis on active aerodynamics and narrower cars, will force teams to rethink their cooling strategies. The smaller car dimensions mean less space for traditional radiators, and the active aero systems will create new thermal management challenges as the car's aerodynamic configuration changes throughout a lap.
Brake Cooling: Ducts, Vents, and Trade-offs
Brake cooling is a separate challenge from power unit cooling. The brakes must be kept within their optimal temperature window, which requires careful management of airflow through the brake ducts. Too much cooling and the brakes do not reach operating temperature, reducing their effectiveness. Too little cooling and the brakes overheat, causing fade and accelerated disc wear.
The front brake ducts are typically larger than the rear because the front brakes do more work and generate more heat. The duct size can be adjusted between sessions based on the track characteristics and ambient conditions. At circuits with heavy braking zones like Monza or Singapore, teams use larger ducts. At circuits with less demanding braking like Silverstone, smaller ducts can be used to reduce drag.
The brake ducts also affect the tyre temperatures. The air flowing through the brake ducts passes close to the inner surface of the wheel, which can cool or heat the tyres depending on the brake temperature. This is why brake cooling and tyre management are linked — changes to one affect the other, and teams must find a balance that works for both systems.
Oil and Water: The Lifeblood of the Power Unit
The oil and water systems are critical to power unit survival. The oil system lubricates the moving parts of the engine and turbocharger, reducing friction and carrying away heat. The water system cools the engine block, cylinder heads, and turbocharger housing, preventing thermal damage to the components.
The oil temperature must be carefully managed. Too cold and the oil is too viscous, increasing friction and reducing power. Too hot and the oil breaks down, losing its lubricating properties and potentially causing catastrophic engine failure. Teams typically aim for oil temperatures between 100°C and 130°C, depending on the specific engine and lubricant.
The water system operates at lower temperatures — typically between 80°C and 110°C — but is equally critical. The water absorbs heat from the combustion chamber and transfers it to the radiator, where it is dissipated to the atmosphere. The water pump must maintain sufficient flow to prevent localised hot spots, which can cause detonation or pre-ignition.
Both systems use heat exchangers — oil coolers and water radiators — that are integrated into the sidepod design. The size and position of these exchangers are part of the aerodynamic compromise that teams must manage.
How Ambient Conditions Change Everything
Ambient temperature, humidity, and altitude all affect cooling performance. Hot days reduce the density of the air flowing through the radiators, reducing their cooling efficiency. High humidity can affect the air-fuel mixture and increase the thermal load on the power unit. Altitude changes the air density and the turbocharger's efficiency.
Teams must prepare for a range of conditions by having multiple cooling configurations available. At the 2023 Qatar Grand Prix, where temperatures exceeded 35°C, teams used the largest possible cooling inlets and brake ducts to prevent overheating. At the Las Vegas race, the same teams used much smaller inlets to reduce drag and maintain brake temperatures.
The challenge is that cooling configuration changes cannot be made during a race. Teams must choose their cooling setup before the race based on the weather forecast and track conditions. If the forecast is wrong — or if conditions change unexpectedly — the car may be running with too much or too little cooling for the entire race.
Where Fans Get Confused About F1 Cooling
The first misconception is that more cooling is always better. It is not. Excessive cooling creates aerodynamic drag, which costs straight-line speed. It can also cause the power unit to run too cold, reducing its efficiency and power output. The optimal cooling configuration is the minimum required to keep all systems within their operating windows.
The second misconception is that overheating always causes immediate failure. In reality, teams can often manage overheating by reducing engine power, lifting and coasting, or adjusting the energy recovery settings. The car may lose performance, but it can continue running. Catastrophic failure from overheating is rare because the engine control unit will protect the engine by reducing power before temperatures reach dangerous levels.
The third confusion is about the relationship between cooling and strategy. Cooling configuration affects tyre management, brake performance, and fuel consumption. A car running with too much cooling may have better brake performance but worse straight-line speed. A car with too little cooling may be faster on the straights but slower through corners because the brakes and tyres are overheating.
What to Watch Next Time You See Cooling Ducts
When you see the cars on the grid before a race, look at the sidepod inlets and brake ducts. Larger inlets mean the team expects hot conditions or has chosen to prioritise cooling over aerodynamic performance. Smaller inlets suggest the team is confident in their cooling efficiency and is willing to trade some cooling for less drag.
Listen to team radio for cooling-related messages. When a driver is told to "manage temperatures" or "lift and coast," it means the cooling system is at its limit and the driver must reduce the thermal load by easing off the throttle before braking zones. This can be a critical strategy factor, especially in hot races where some cars manage cooling better than others.
The next time you see a car suddenly lose pace in the middle of a stint, consider whether cooling might be the cause. A car that started the race with aggressive cooling settings may find that conditions have changed — a cloud cover reducing ambient temperature, or the car running in cleaner air — and those settings are no longer optimal.