But an exhaust leak coming from the car when it is cold? How cold is the car? I mean like the ambient temp? If it is REALLY cold then yes I could see the water running down, but do you know how BIG of an exhaust leak you would need in order to have so much water run down to make a basketball size puddle. Still sounds like A/C to me, even though you say you might not use it that much. If it IS really cold, it could be some sort of frost on the o2 pipe that is running down.
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