A heat exchanger air control system is provided that utilizes a central heat exchanger and a pair of side-mounted heat exchangers, where the side-mounted heat exchangers are positioned forward of the central heat exchanger. The air outlets of the side-mounted heat exchangers are coupled to both the air inlet and the air outlet of the central heat exchanger using several air ducts through which air flow is controlled, thus allowing air flow throughout the system to be optimized based on the needs of the thermal systems coupled to the heat exchangers. A single fan proximate to the outlet of the central heat exchanger can be used to draw air through any combination of the three heat exchangers.