Engine diagram
Had a constant, slow radiator fluid leak from the center of the car.
Tried replacing the thermostat housing O-ring, but that didn't do the trick. Finally tracked it down to a split on the underside of the plastic thermostat housing. Found a replacement housing at NAPA for under $5, popped it in and haven't lost any fluid since.
You couldn't see the leak from any angle, so it was just dumb luck that I touched the underside and found it wet. You couldn't even see that it was split once it was off the car, either, but under pressure it was leaking.
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