Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to diagnose a non working air conditioning in a car [title] Turn the air conditioning on while the car is running. [step] The air conditioner won't run properly unless your engine is running. The best setting for diagnosis is " fresh air " (not recirculated) with the air blowing out of the center vents in the dash and the ac turned on.

Ending1: [substeps] Start with the fan speed turned to its highest setting. If your car has a " max ac " setting, select that option. Ending2: [substeps] Because a car runs with the air flowing into an air conditioning vent, it is still prone to congealing. It either has either passed out through the vent or is sealed and trapped. Ending3: The air will travel through the vents without any problems but might not stop. [title] Look at the console, the dashboard, and the tires to see if there is an ac adapter. Ending4: [substeps] Don't open one of the vents unless you are close to a fan or if you are within a car with a lot of air rushing out. That will signal that the air is fresh, not stagnant.

Answer format: ending1/ending2/ending3/ending4