How much variation in temp do you see normally?
As long as I am moving, it stays on the same spot on the guage.
Like this...
Just about anytime I sit at idle it starts to go up pretty quickly... like in a drive thru or stuck in some stop and go traffic.
It has never overheated, but it has gone high enuff to shut off the A/C a couple of times. I put it in neutral and take the RPM's to about 2500 and it goes down almost immediately.
My Pfinder has been this way since I bought it. Of course, it is only a problem in warmer weather. Gotta worry about it a bit more with a hot Texas summer approaching.