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It likely has little to do with the electric load and more to do with the defrost for the front and read both requiring the ac to be active to dehydrate the air. Notice that there are little vents on the rear deck that will actually blow a bit when defrost is on back there.

Your electric load is probably high, especially at those times because the systems and Ac do require a lot of power as the heater in the seats and the rear defrost is basically a resistor path.

The electric load isn't helping either. These engines produce little torque at idle so they have more trouble overcoming the extra loads on it.
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