Does anyone know how to force the A/C to use IMA battery while the car is parking? I've tried to turn the key halfway on, before cranking to the start engine. But leaving the key at this position would turn on all the lights in the dashboard and I am not sure if it gets all that power from the little battery in the hood or from the IMA batter in the back. Anyone knows the answer? The reason I ask is that I want to use the A/C while the car is parked and do not want the engine to be running... Thanks!