Leaking radiator should smell a little sweet and not at all musty.
If you get a musty smell, that’s simply due to mold having formed somewhere in the aircon system or within the vehicle body itself. Mold is caused by standing water and can have a couple of sources.
Water can leak into the cabin from the engine bay around the cabin filter area. So make sure that the drain tube within the engine bay cabin filter area is clear. I think there was a service bulletin for VE/VF that also looked at some seam sealing and cabin filter box leak issues but have no reference.
There was also a tendency for mold to form on the evaporator which could remain wet in some instances. The VF service bulletin allowed for an afterblow feature to be turned on which in some instances continues to blow air through the evaporator to dry it out. I have a link to this bulletin in a post on another thread which panhead has linked to, so follow the white rabbit if you’re curious.
Lastly, there was another VF service bulletin which replaced the evaporator drain tube within the cabin. Water from the evaporator under your dash would leak inside the vehicle rather than been dumped on the ground outside. The leak would pool water under the front and rear passenger carpets causing mold. The changed tube fixes the problem and in some cases Holden cleans up mold on the floor and replaced carpet and underlay. Sadly, the link to this service bulletin I had to the service bulletin is dead. See this
post for some details. There are other issues listed at
oemdtc.com so some other white rabbit to follow if you’re game.
So, if it is mold you smell, also discuss the above mentioned three causes with your dealer.