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Could be a few things... My guess, though, is a cracked head gasket. 3.1L's from GM were pieces of crap. However.. you're water pump could have went, your intake manifold, or it could just be your thermostat... you'd have to take it in to be sure, or get a little more detailed...
Just a little note for the person who stated that GM 3.1L's are crap,I have owned a '94 Oldsmobile Cutlass Supreme for about 5 years now and i have yet to have a single engine problem. Thermostats are usually the culprit unless you have repeatedly overheated it.
I also have 94 olds cutlass supreme with GM 3.1L and have owned it now for 4 yrs and mine has 230,000 miles on it and still runs strong with no major maintenance to it at all.
That motor with the hydramatic tranny is bullet proof even when driven hard. And I drive mine hard everyday to work and back home.
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oldsmobile. to me it might seem cause its old.
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