So I have a coolant leak that only comes up if I run the car long enough to start building heat in the engine, but not long enough to open the thermostat. If I drive home from work (maybe 2 miles) it'll leak a cup or two from the bottom side of the engine, but if I drive it around all day looking at houses, it doesn't leak a drop. It shouldn't be the water pump, as I already replaced that, it did it before and after I replaced it. When I got the car, it had a 14lb radiator cap, it's been replaced with a 16, but I've been debating if I should try and go back to the 14. I haven't been able to find the leak, as getting the car up in the air is a bit of work (lowered, so it doesn't fit on ramps, and by the time I break out the jack and stands and get it up, it's done leaking). Anybody ever seen one do something like that, or have any advice on tracking it down?