hmm ok heres my 2 cents, i hope i get some feed back cause half the time I post its like at the end of the thread like and no one gets any of it.
I changed my coolant the other day, used a flusher to get rid of any crap in the system. Done all fine and dandy except for getting that stupid bleeder screw off!

So when i go to work the next day I notice the temp gauge is reading a little higher than it used too. I used 50-50 mix and even dumped a bottle of water wetter in the thing but when i get in stop and go it shoots up to the "L". Never really did that before. SSooooo Im wondering if maybe because i took off the rad shield (big plastic peice underneath engine) and never put it back on could contribute to this? I also messed up and when I used the rad flush i put it in with the coolant, was supposed to be just water and the rad flush - would that do anything? I changed the thermostat last summer, so i doubt its that.