Originally Posted by Gerald
I had a similar problem, but the water was comming thru on the LHS (mine is a RHD) turned out that the drain under the front windscreen cowl was blocked and the rain was not draining through - result was that it was filling up and then over flowing into the heater air intake. Cured by removing the cowling and cleaning out the drain with a stick! Hi tech fix!!
same here on mine. Removed the wiper arms and cowl panel... keep in mind there are some hidden screws that run horizontal behind the big rubber hood/ cowl gasket.
Instead of removing the wipers and cowl panel, I wonder if running a wire hanger through the cowl, and into the drain would help dislodge any debris.