Burning smell under the hood and light came on saying coolant low refill, had it refilled and that is when I smelled burning smell

Your main issue here is that the coolant was low. Check system for leaks (system includes anywhere coolant flows through or to including all engine gaskets etc) very carefully to find any seepage and correct whatever you find. Burning smell is likely related and either you will find exactly where the smell was coming from while looking for the coolant leak, lor as the engine cooled down when you added fluid the source disappeared. (oil residue on engine will smell when it becomes hot)

It could just be the smell of anti-freeze that was spilled onto the exhaust or is sitting in one of the many little "pool"s on the top of the motor. Does it have a sickeningly sweet smell - like molasses? If so, that is most likely the problem . You can try hosing (very light pressure here!) off the engine compartment to rinse off any that has spilled. If you do this and still have this problem - I would check for leaks - both while the car has been running for 10 minutes or so, and also AFTER it has been shut off after running for the same amount of time.

Hope this helps!
KC GTO Dad

Is your car new or second hand? And what does the smell smells like? If the car is new it sometimes is associated with the wax coating that the manufacturer uses to protect the engine and components from the enivronment when they are left stored in their yards before shipment to the sales showrooms. But if your car is second hand, then I suspect there is a coolant leak somewhere where the liquid is leakin on the exhaust manifolds, releasing burning smell. But (again) if the car is very old, then there may be liquid contact switch that is submerged into the liquid, that, when the engine is running hot, the liquid is boiling and causing the surface to 'wave' against the contact switch. During this event, the switch may miss the liquid and gives you a false signal. A check in the radiator with the cap off and looking inside the radiator to see if the liquid flows slowly or fast. If slowly, there may be other issue on your problems. If it flows fast, then the thermostat is faulty. Either way, seek advice from a Saab expert. But I suspect the switch is faulty.

I wouldn't be too concerned! Sometimes the fluid is spashed or spilled onto the engin when your filling up the coolent or oil and its just burning off the engin. Just watch the temperture gage and check for any leaks on the ground for the next couple of days to be cautious. After a few days of driving the smell should go away on its own!