95 Olds Aurora Overheating???!!! HELP!!!

in Oldsmobile
Hello, I have a 95 olds aurora, and it keeps overheating, then shutting down. I just had an oil change because the car kept reading low oil pressure, and then I notices that the fan was out that cooled the engine, and I was told that it was the temperature coolant sensor, so I replaced that, but it's still overheating!!! Just the other day I was told that it was something to do with an electrical sensor that turns the fan on, but I don't know what that is. Can someone help me, I have a 10 month old son and it's the only transportation that we have, and can afford! HELP!
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Randy
Thanks for your advice. I joined this forum just to thank you and also to let other guys know that they should check that out before spending a fortune at the garage.
The gases try to find a way out and usually they go through the cap in the reservoir, forcing with them the loss of water.
It overheats because the gases start to accumulate and obstruct the proper flow of the water, making bubbles inside the system and the more it heats up, the more water it spits up the cap. A vicious circle.
If I leave the cap a little loose, and only drive it on the city streets under 50 MXH, and stop once in a while in red lights, while idling and no effort, the gases are expelled faster than they are sipping in, so the car starts to cool off and even goes to normal, but the process is repeated once you start driving constantly.
Freeways don't work for it any more if driving constantly without stops.
It's screwed and it has to be repaired.
At least I can still drive it but very limited.