Getting Hot while in traffic.

Anyone know when the fans should come. I have heard there is a low and a high. My wife's 1998 V6 3800 Camaro tries to heat up while in traffic jams (idling). No over heating when driving, just when idling for long periods of time.

Check for proper air flow no excessive bugs or other items blocking air flow. The radiator cores have a habit of plugging if antifreeze isn't changed.