I did a search and read for about an hour, but I can't find enough information to put the pieces of this particular problem together myself.

THE PROBLEM: Out of nowhere I noticed that the temp needle on my 98 EX is about 3/4's at a stoplight. Goes back down when I start driving. Since about 2 weeks ago, my engine will get about that hot at a stop, but will cool off once I start driving. Only 3/4's doesn't sound like an immediate emergency, but it's not 115 in Vegas yet.

THE FACTS:

1) Water pump replaced last year when I did my timing belt. (Probably not water pump)
2) I have not changed anything within the system since that change last year, so I don't believe the system needs bleeding. (Probably not air bubbles in system)
3) The fan DOES turn on when I'm at a stop. (Probably not fan)
4) All hoses are warm, so that makes me think that coolant IS flowing? (Probably not a clog?)
5) Coolant is filled and clean. No leaks. (Not lack of coolant)
6) While driving, the temp is right where it needs to be. No fluctuations. (Probably not thermostat?)
7) At a stop, while the temp is rising, I can stop the rise with about 2500 rpm. Make it go back down to proper temp at 3000 rpm.
8) During winter this year I was having a hard time getting the air out of the ducts warm unless at constant power (highway speeds). However, engine temp was always perfect.
9) The radiator has performed flawlessly in St. Louis 95+ degrees, so it should be able to handle 75 degrees.

I am at a loss with this. I'm staying with my sis out in LV because I lost my job...soooooo, I'm without much money and definitely without a garage. So, I'm trying to get this right the first time because I no longer have the luxury of just throwing in a different part to experiment with what this may be.

Any ideas guys?