A few days ago I noticed the sweet burning smell of coolant once my engine ran for a few minutes. I looked in the reservoir and it is at the proper level, however the liquid in there is not the bright green liquid that is in the radiator. I took the radiator cap off while the car was shut off, turned the car on, and noticed that the coolant in the radiator is not circulating.
** I get heat when the car is warmed up,
**the temperature gauge is not overheating (we have had extremely cold temps -9 to 19 degrees F), but it does rise past the halfway point.
** I do not see any coolant spray under the hood or on the engine.
Please give me some ideas as to what the problem could be so that I am informed when I take it to a garage.