coolant
Check your Bi-pass hose...very hard to see and if it's leaking you will not see it cause it only does it when you turn the motor off and pisses on the hot motor and drys up...it;'s a bitch to get to....
it's a small 1/2" or so in Dia. about 3" long that runs from your manifold to your block...look behind the pump very hard to see...like stated ...I had a pin hole in mine.