Dont think the heater core would be bad since it is on drivers side floor..might wanna check weather stripping for cracks or from being worn out..trick i learned for checking if weatherstripping is bad is to mark a thick line of chalk around the whole side of weather stripping that comes in contace with the door, close the door, then open it up...if the stripping is doing its job you should see a steady line around the door and on the weatherstripping. hope i explained that good. Might also wanna see if the wipers that guide the window (located on base of window and inside feels like felt) are good and not cracked.
__________________ Paul
97 SL2 (5spd, Street/Autocross)
94 Eclipse GSX (5spd, Street/Drag/Autocross)
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