AC warms up when sitting still and slow traffic.

Cleaned condor. That helped some. My question, is the two speed fan supposed to run on high speed when idling? WO ac on the fans don't run, but they might if the engine heats up. When the ac is turned on the fans run on low speed when idling or slow traffic and the ac warms up until you pick up speed. Seems like the fans should run on high speed when idling or slow traffic which would do a better job cooling the ac condenser.