Okay, now I get it. The steam was OUTSIDE the rear window, not inside.
If you blew enough steam to actually see it, you had a catastrophic failure.
My guess is you blew a head gasket. If you are lucky, you blew a hose that
blasted steam under the car and out the back. If the Temp Guage made it to
the red mark, then you might have issues related to a cracked head.
A head gasket failure will blow coolant out the tail pipe in a large white
cloud, a blown hose will make steam from water-based stuff splashing off of
hot exhaust components. There is a difference in what you see in the rear
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