Hi thank you for your question i can help.
Ok you say you replaced the water pump- thermostat - sending unit.
Can you tell me is the cooling fan coming on?
Also if you turn on the A/C will it cool down the engine??
These will help me help you
I DON'T KNOW, I DON'T THINK SO. I CAN TURN ON AC UNIT,DO YOU THINK THAT WILL HELP.
Ok your Saturn has two cooling fans one is for the engine that is controlled be the sending unit you replaced. But if the fan was not working replacing the sending unit would not help.
The other fan is for cooling the A/C cooler but it also cools the radiator.
This is an easy way to see if the engine cooling fan is the problem.
Start the engine and let it worm up if the engine cooling fan has not come on.
Then turn on the A/C This will turn on the other fan if it comes on and cools the engine then you know the engine cooling fan is bad.
Hope this helps
Good luck
Auto Service Technician
Certified Master Technician,Certified in diesel & gasoline engines