Got a 94 Wagon with the vulcan engine, overheating and stalling out on me, with a rattle while accelerating. Was driving like a champ the last 2 weeks, then all of the sudden last night it stalled out on my wife while she was driving home and it overheated, first thing i thought was a headgasket, but the oil looks good and clean and there is no oil floating in the coolant, but there was almost no coolant in the tank when she got home last night.....i'm lost, any ideas?