Improving the operating efficiency of a rear door heat exchanger, including: determining, by a ventilation management module, a temperature differential between two temperature sensors in the rear door heat exchanger, the temperature differential indicative of cooling efficiency in the rear door heat exchanger; determining, by the ventilation management module, whether the temperature differential is greater than a predetermined threshold; and responsive to determining that the temperature differential is greater than the predetermined threshold, taking corrective action by the ventilation management module.