It was dripping from behind the glove box down to the floor. I'm guessing its the heater core. The windows fog up when its sunny and theres a light sprinkle of rain, even with no rain. It has that smell warm wet smell. feels moist in the car. What could it be and if it is the heater core how do i install myself? What tools will i need? I cant afford 500 for installation from a mechanic. I can only afford the part. Also the air conditioner sucks. Not cold like it should be.