Abstract: A system and method for determining engine operation for a start-stop vehicle is provided. The start-stop vehicle includes an HVAC system. The engine operation control system includes an HVAC control head for indicating demand, a sensor for indicating fan speed, at least one sensor for indicating ambient air temperature, and a powertrain control module in communication with the HVAC control head and the sensors. The powertrain control module determines engine operation. The method for controlling engine operation includes the steps of determining HVAC demand, fan speed, and ambient temperature to a control module. The control module determines engine operation based on the signals from the signal generators of the HVAC demand, the fan speed, and the ambient temperature.

Abstract: A condenser that includes a top manifold defining a first volume of space and a bottom manifold positioned below the top manifold and defining a second volume of space that has a magnitude that is different than the magnitude of the first volume of space. A core positioned between the top manifold and the bottom manifold, the core including a first set of condenser tubes that are in fluid communication with the top manifold and a second set of condenser tubes that are in fluid communication with the bottom manifold.