Hello all, 

i have a 09 kia spectra ex that has been acting strange for the last month or so. At first I noticed my temperature gauge fluctuate between the middle where it normally would stay as in most cars, but would go up halfway to the high , then back to the middle, then back up to high. I checked the coolant tank and it was pretty low so I added some coolant. Now instead of fluctuating as I mentioned above it stays in the middle and only starts to go up when im idle or when im driving slow. I also notice that when the temperature gauge starts to go up from the middle my air conditioner gets warmer. 

for example ill be driving and itll stay in the middle and the AC will blow cold just fine, but when I stop at a traffic light, after a couple of minutes the temperature gauge starts to creep up and my AC will start to get warm as well. But as soon as I start driving again my temperature gauge will go back down to normal and my AC will blow cold again. I checked my fans and they are both turning on do I am at a loss. I appreciate any advice as to what the cause may be.