As Tombie said check all that and if you have a sunroof check the drains and that the pipes are connected all the way down.
However there is a design issue with A pillar and its outer trim. There is a tech "advice" and fix on this from Landrover UK - I do not have it to hand,
Basically water runs down the outside of the A pillar and into the holes that the external trim clips into and then down the inside of the A pillar and into the inside of the car - result is wet or damp carpets. Basically the fix is to take the external pillar trim and retainers (clips) off and with something like gaffa tape put the tape over the holes in the pillar. Put a little sealant around the points of the clips or even on the bits of tape and put the trim back on.
The tape basically seals the holes and when the clip is pushed through when refixing the sealant seals any thing missed.
On my car, after checking the AC drains and still getting water in the footwell I came across the tech advice and followed it - fixed my damp footwells.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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