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to power the additional AC and power supplies needed for the more modern combat systems carried on board.
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AFAIK proper air conditioning in relation to combat systems is usually provided only to support the TI sight and these tanks are apparently not fitted with TI.
The remaining systems, can easily do without although naturally cooling systems are needed for the engine and such heat generating systems. While Korea can get hot in summer it is not a desert and even in that case heavy AFVs are typically given little or no AC.
I suspect that the extra roadwheel set in the new "boxy" tanks is to support the extra weight, largely due to the armor increase. Probably same reason the dedicated Black Eagle hull got the seventh roadwheel set.
Maybe they were designed to be protected against 105mm ammo or such, though increase in fuel/armor may have been included as well.