I just recently got the thermostat on my car replaced and the guy told me that I needed a coolant level sensor because the old was bad and so he disconnected it. After a few days I kept smelling coolant and I looked for leaks under the car but I didn't see anything... After that my temperature guage has been acting wierd. It keeps moving around. One second its at the normal temp then the next its close to the hot temp. And back and forth during the whole drive. The car is not smoking and I opened the hood after driving it for a while and it seemed to be normal. (I touched a few parts) Could this have something to do with that sensor I need or is this another problem...He also flushed the coolant system out when he did the thermostat.