The front bumper improves cooling to the radiator and front brakes while reducing drag. Water cooling carries waste heat to a radiator. Cooling is via an externally mounted radiator. The two rear compartments (each containing a fuel tank, radiator and fans) were floodable. Cadillac script also appeared on the lower left side of the radiator grille. Engine cooling was improved by switching the locations of the fan and radiator. The array was cooled by heat pipes connected to an external radiator. Mechanical changes included a strengthened steering rack and a power steering oil radiator. Underneath the cowling was a revised, more streamlined oil cooler radiator and fairing. A new radiator, shallower but wider than that fitted to the E was developed. The airflow through the main radiator was controlled by pneumatic exit flaps. Modifications included the adoption of a fixed undercarriage, large ventral radiator, and an auxiliary intake. This was the final version, twin point injection with front-mounted radiator. Horns were moved to in front of the radiator from the engine compartment. The second radiator is plumbed in series with the main radiator in the circuit.