In my experience Dexcool is more prone to leak than IATs because Dexcool has no salts that can precipitate out to seal minor seeps.

There is no reason why G05 should immediately cause leaks if used to replace IAT.

Thus far I've replaced a leaking heater flow valve, leaky coolant level sensor, and a leaky aux. coolant pump. It just goes with the territory. So far my radiator is okay.

There is a plenun drain above the transmission where the coolant leaking from the heater flow valve dropped down, leaving residue on the transmission. A leaky heater core would probably drip from the same area.

Not too many have reported leaky heater cores, but the aux. coolant pump, heater flow valve, coolant level sensor, and snapped radiator nipples are relatively common. Sooner of later all these problems will happen to all of these cars.

Three down, one to go for me.

Duke