The air pump probably will never put out enough air pressure to be useful as an air compressor. You can convert an AC compressor though to an air compressor. The RV2 that chrysler used for years, you probably removed it, and the york compressor both work great. Do not use a rotory or saden compressor. They do not have a resorvoir for oil and use the oil flowing through the AC lines to lubricate them. When you remove the AC lines you remove the oil and have to rig up some way to lubricate the compressor then.