Originally Posted By: defektes
There was a problem, car all of the sudden has irregular temperature fluctuations. That may be normal for you but for pretty much everyone else that aint normal. And a Tstat can be bad and the rad fan still turn on.
I think you're reading way too much into what OP has reported.
There may be other info forthcoming, but so far all he's said to describe the "problem":
"drove about a mile from the house to fill up on gas, then drove another mile to pick up some fast food, i probably waited in line 3-5 mins i would say, and when i left i noticed the hot-cold gauge was 2/3 of the way up, it usually stays 1/3 of the way up, so i knew something wasn't right."
and later:
"when out and let the car idle for about 10 mins and it didn't run hot, so i took it around the block, when i got back and let it idle again, the needle slowly went to 1/2 way up and the passenger side fan did come on !"
Conclusion: One time, temp gauge read 2/3 from an extended idle, and fan came on. Normal!
Just because OP has never noticed this happen or likely, the same conditions have never been duplicated before doesn't mean there was a problem. OP overreacted and did not follow proper trouble-shooting sequence to actually tell IF there was a problem, but instead threw a part at it.