Petr, my AOP at serial 84xxx (which is much earlier than your MKIII) still has the two holes in the rear lower hull. It then had a bolted on duct that took the air flow to vertical up through the rear deck via a chimney with a closeable baffle.
I'm not sure how it was used- I guess it was to keep the snow out, at which time the total air flow exited via the rear vented engine cover.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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