Oldsmobile/Buick Repair: overheating, blown head gasket, coolant level

Question
my 2000 alero has a 2.4 engine.  it has been overheating.  we have replaced the thermostat as well as the goosneck that the thermostat is attatched to and it still overheats. also the light next to the change oil light comes on. I can not find my owners book to find out what that warning light is.  can u help me please???

Answer
Hi
First I cannot tell you what the light is as my information just lists lights not where they at on the cluster.
As for the overheating, there are many things that can cause overheating.
I would check for coolant level being properly filled.
Check for any blockages in the cooling system.
Check for any leaks.
Check for proper fan operation. Making sure they come on.
If all checks out, then I would then turn attention to an internal engine mechanical problem.
A Blown head gasket. Cracked head.
These can all be checked at most repair shops, they use a tool  known as a "Block Tester".  A Blue fluid is added to a suction device, and air is drawn up from the radiator.
If there is a presence of exhaust gasses, the liquid will turn green or yellow.
Thats what I would advice at this stage.
Have it all checked out.
I Hope this helps
Pawl