All of a sudden (after the car had been sitting) the coolant level in my Cougar dropped enough to turn on the low coolant light... The last time it did something like that it was leaking from the seam between the radiator core and the PS tank. Since that last happened, I have done the Exploder swap, installed new heater core (which has been grounded to the chassis since day one), and Cobra radiator/fan. The oil looks fine, and I have never seen any puddles under the car (unless it has been raining). Anyone have any ideas? I'm stumped.