Adam, the rear Cruiseair is most likely not behind the front bumper. My Liberty has two up front and the third one is mid coach. You might find it by looking for the air discharge opening under the bus. See what the ones in front look like and then find another opening that looks the same further back. Like others have said, any good A/C tech should be able to check and recharge the unit. Good luck getting it going. You need all three to stay comfortable.