My check engine light stays on in my 2008 Hummer H3. Thermo gauge is near "H".

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After I arrive at my destination, I can smell a faint aroma of antifreeze but when I open the hood, I don't see any leaks or problems with the hose. I constantly watch my temperature gauge while driving. Although the needle has not reached the red mark / H, it goes past the mid point on the gauge and stops just below the "H". I have not checked for a code as of yet but I will tomorrow. I was going to do some basic things first (purchase a new gas cap, oil change, check and refill all pertinent fluids). However, it still remains on, It is not flashing so I hope it is an easy fix. What seems to make the problem better or worse? If I pull 2 fuses, it goes away for about 20 minutes How long have you had this problem? Since August 12th (approaching the 3rd week)