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When the AC is on and the ballast resistors are OK, the fans run at low speed even if the coolant is cold. IIRC correctly, when the AC is off, the fans will run at high speed when the coolant reaches a certain temperature
Because your coolant temperature goes up to a certain level and stops when your car isn't moving and goes down when you move forward, my bet is your ballast resistor have failed and the fans won't operated in low speed mode.
As another poster suggested, try turning on the AC first thing in the morning when the coolant isn't hot and see if the fans run in low speed. If they don't the ballast resistors have failed.
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