since i've bought my used car i've always have problems with temp... this is what happens...

when the level temp goes 3/4, the radiator's fan starts, and quickly goes cool, at this time some water was wasted on to deposit, wich is already full.
after some minutes, level temp goes high, and i need to accelerate to 3000 rpm and again level temp goes cool again...
theres no water wasting in no place, just by deposit water when the temp goes high.

 

yea i have the same problem im just gonna assume that its the sensor since weran the F*** out of it. About full throttle for around 5miles up hills. the car didnt blow up or anything go wrong so it cant be overheating like it says.

 

sounds like the sensor in the resevoir.