Did you flush out system good and replace thermostat, when you got the job done! i did my intake gaskets last year and as long as it was torn down, i put in a new thermostat, and when done i flushed out coolant system. it runs very good! 2000 malibu 3.1, make sure coolant fans are coming on when called for. if not check fuses and relay. to test fans to see if they work. run a wire from positive post on battery to positive on fan connection. run another wire from negative post on battery to negative connection or ground for fans. if they run this way ,then the most probable cause is the fan relay. have a good one !!
Did it over heat be for he change the gasket? if os i would be kooking at a head gasket is out
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