Before contemplating butchering your Defender, why not try setting the heater controls to FRESH AIR and to FOOT WELL with the fan ON.
Then add an intake scoop to the heater vent on the front (L) guard and see whether the forced air induction through the existing system helps.
I'm not saying it will, but at least it's worth a try .
I like the look of these vents, but you can get a single scoop type, which I think will probably be better, as it could easily be occluded for a river crossing, whereas this SPORT version would be more problematic.
Just another idea to throw in the mix.


				
				
				
					
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