Overheating on 1999 Oldsmobile Intrigue

I recently purchased a 1999 Oldsmobile Intrigue. I flushed the radiator with Prestone Radiator flush and filled the radiator with 50/50 Prestone coolant. However, the car is acting like it is overheating. I replaced the thermostat and when I finish driving the car, the radiator fluid will spew out as though it is very hot. What can be the problem?

Asked by for the 1999 Oldsmobile Intrigue
Need to know which engine you have. It could be that the radiator is plugged with Dex-Cool and is not allowing the new coolant to circulate. GM had a lot of problems with this. Also, the 3.1 and 3.4 liter engines tend to leak coolant from the intake manifold gaskets, sometimes it is internal and you can't see the leak but the car can still over heat.
It is a 3.8L engine.
It is an 3.8L engine.
I also have a 3.8 99 intrigue and its been overheating for a long time. Did you ever find out why? I've done everything but replace my radiator. I replaced the water pump, thermostat, i flushed it out with the same prestone stuff you did and put the right mix coolant in and itsstill overheating bad. But lately it wont start because the timing is off i need to know how to set the timing would you happen to know? Once i get my car started then i'll have to take care of the overheating. And mine does the same thing, my gauge wont say its hot, yet there'll be smoke coming from the hood, and i've looked closely while its smoking and not coming from the engine its coming from under the overflow...i dont know what that means. Any help would be appreciated..thank you.
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99 Intrigues actually have several recalls. Check the recalls. One of them is oil leaking from manifold down on to spark plugs. Can cause a fire. Take it in and have a new cover put on it. That smoke is not cool. Not steam-smoke.