Ive started to pay a little more attention to my cobalt since hittting 50,000 miles. Ive noticed that while driving my cobalts temp will stay around 190 degrees but while idle it may rise as high as 218 degrees. Ive checked the manual and it doesnt give a normal running temp that the car should remain around. My light hasnt come on, no steam and my coolant level is normal in amount and color. I have a feeling it may be the water pump but am just not sure. Any comments?