I noticed today on the front passanger floor mat about a 1/2 cup of a very thin clear oil. The housing around my heater core/ac evaporator is cracked and it sometimes drips some water on a humid day, but this time it was oil. Naturally I assumed it was just a ton more water and dumped it out on the concrete driveway. So now I have a big oil stain on the driveway and oil leaking inside the hoe. Anyone have any ideas on what needs to be done, or do I need to replace evaparotor coil and lines.