The temperature gauge has not reached the "red" zone yet so I can't say it overheats, but the gauge is reading notably higher. It only takes 5 to 10 minutes for the gauge read close to the "red" zone. I have been running the heat on full to help keep it from getting even hotter. This happened all within the last week. After I have parked the car the radiator fluid backs up through the coolant tank and out from under the cap.
No parts have been replaced. Would you be able to tell me where the thermostat is located on this car(2000 Saturn L-series)?
Here are replacement instructions for the thermostat which is about a $15 part. Let me know if there is anything else I can do to help, thanks Michael.