Keith Marshall wrote:
Have you looked at the oil? You need to find out if water has gotten
into the oil. I suspect it has since it overheated and that can be
really bad.
Pull the oil dipstick and hold a lighter or flame under it. If
there's coolant in it you'll know because it'll boil out. It also
may look foamy which usually means there's quite a bit of coolant in
it.
We've had this happen to 2 vehicles and in both cases it was easy to
fix and get them running again but they both failed soon after
because the bearings were ruined from lack of lubrication with the
oil diluted so much.

What happens is the antifreeze etches the bearing inserts , and then they
fail . Any time a GM (ours was a 3.1) V6 drops intake manifold seals
(usually from an overheat) , there is a chance of coolant contaminating the
oil - which turns it into an emulsion with the consistency of grease . My
wife's '96 Corsica did this , we completely rebuilt the motor - rod & main
bearings , cam bearings , rings and all new seals and gaskets . It had
87,000 miles on the rebuild when we traded it , still got 29 MPG and only
used a half-quart of oil between changes (every 5k miles) . She wishes she
still had it , her mini-SUV only gets 19 MPG ...
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