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What do you consider "hot"? If it is the normal operating range I wouldn't sweat it, if it is approaching the red mark, then there is a problem.
The aux fan only runs when either the high pressure switch in the AC calls for it (NOT whenever the AC is on), OR if the engine temp switch calls for it (if the coolant temp is hot enough). If the AC calls for the fan it is low speed, if the engine calls for it it is high speed.
One thing to look at if the engine runs hot pretty much constantly, is if the outside of the AC condensor or the radiator itself is plugged up with dirt, dust, leaves, bugs, etc. Can be cleaned up with high pressure water, just not so high that the fins on the radiator could get bent.
I think the additives are a waste of money. If the coolant seems dirty I'd recommend changing the fluid. I'd recommend either the coolant MB sells or Zerez G05, the local parts store should carry the Xerex.
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