Engine Tends to overheat while idling/stopped

When I'm at a read light or in heavy traffic the engine begins to over heat. I was told (by shop teaching a year ago in HS) to put on the heating when this happens, I did that today, it did take care of it, but I DO NOT think I can do that much longer because summer is here :) anyways, the radiator was full, it is circulating fine, what can be the problem?

step 1 - replace thermostat
step 2 - upgrade ECT to new brass style if you haven't already
step 3 - install fan override switch

step 1 - replace thermostat
step 2 - upgrade ECT to new brass style if you haven't already
step 3 - install fan override switch

Ok will replace the thermostat and upgrade the ECT to a brass one tonight, and if they wont work, I will try option three.

If there a guide where I can see, where the thermostat is located and the ECT? (I'm not much experienced with the engine yet, just started looking after it my self I cannot afford a mechanic for a bit)

thermostat -
http://www.saturnfans.com/forums/showthread.php?t=26708
http://www.saturnfans.com/forums/showthread.php?t=26261
ECT -
http://www.saturnfans.com/forums/showthread.php?t=24003
http://www.saturnfans.com/forums/showthread.php?t=37884
manual fan switch -
http://www.saturnfans.com/forums/showthread.php?t=23668

thermostat -
http://www.saturnfans.com/forums/showthread.php?t=26708
http://www.saturnfans.com/forums/showthread.php?t=26261
ECT -
http://www.saturnfans.com/forums/showthread.php?t=24003
http://www.saturnfans.com/forums/showthread.php?t=37884
manual fan switch -
http://www.saturnfans.com/forums/showthread.php?t=23668

Thanks a lot! Really appreciate it!

I have bought a new thermostat (from an auto parts store, they said its oem and up to 180 degrees which is factory)

they didnt have the ect so gotta get that from saturn tommorrow (hopefully open)

check system presure. if the correct pressure is not present fan will not turn on if it does way to late.