2003 Saturn ion coolant light flashes on and off. No noises or burning smell. Not over heating and still has hot air.

If everything is working fine, except the light, its either a bad coolant sensor, loose sensor contact, or bad ground etc.

Sounds like your electric fan is not coming on. Do you have heat? if not it might be thermostat, if yes, listen for or look and see if your electric fan is coming on

The coolant light is a bad thing. You need to check the coolant to see if it is low. That would cause the light to come on. IF it is low you could over heat the engine and that would cause a major problem.

Try adding water absorb ant fluidd, ie heat. To fuel. May have condensed water in tank. Popped a fuse or breaker

overfill tank

There should be a radiator cap as it controls what goes into the overfill tank. You might consider replacing it. If there are no leaks in the radiator or hoses, there are only 3 places the coolant can go (water pump leak, blown gasket, or out throught the radiator cap). Hope its the cap because that's the cheapest. Good luck!

if the smell only comes on when the heater is on try pulling the blower motor mice like to build nests in the blower motor housing.

stuck thermostat.  Engine may be toast.

You need to replace your ignition switch. If it has already been replaced then you will prob. need a BCM.

I had the same problem. My 2004 Ion had 85000 miles on it. It was a bad sensor. The whole coolant reservoir tank needs to be replaced to fix the problem. This was covered under the extended warranty that we had. If you are doing this repair yourself, a hose clamp tool is recommended for simplicity.