Kitten keeps going into hood of my car!?

While my boyfriend and I were attempting to change my windshield wipers, we heard a noise coming from the hood of my Suburban. We opened it up, and it was a kitten! We had a pretty hard time getting him out, he was small enough to be able to crawl through all of the spaces throughout the cars and was even able to walk on some beam that led from the front of the vehicle to the back. We finally got him down with some food, and we carried him from the cars to a nice shady, grassy area. We were petting him and he took off and hid in some tall grass. We brought the food and also brought some water out, and then left him be. I checked on him a few times after that, each time he would get more friendly. He finally got used to me, and actually tried to follow me back into the house. Now, my mom is allergic, so he can't go in. He's going to have to be an outside cat (I'm actually still trying to find him a home.) So once he realizes he's not going in.. he goes and hides underneath one of the cars, be it my moms Charger or my Suburban. The thing is is that I doubt she'd check to make sure the kitten was not there before she started her car. Also, my battery has been dead, which is why my vehicle has not been driven for a few good days, but we're going to be changing the batter soon so the kitten can NOT be staying in the hood of that car. Anyway we can break this of him? He needs to stay away from all of the vehicles, but I guess that because we found him in the hood of one of them, that's where he feels safest? Anybody else have this problem before? Thanks!