air compressor

This has been in my mind after going over virtually all of the mod threads in the last two weeks. I would like to install on-board air, whether it's filled with an on-board compressor or in the shop, to air up tires after hitting the trail. I've thought about using an old air compressor tank...

The air conditioning on my explorer is not working properly. The compressor kicks on and off but it is every couple seconds so it seems low on refrigerant. I was wondering if it sounds like i just need to get a recharge or does it sound like i have a leak. I purchased the vehicle recently so i...