Join Date: Apr 2016
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RD, the scoop is shaped so that it will prevent water from entering via the hood vents when parked. It is only intended to prevent water from entering via the vents while parked! It will allow about the same amount of water to enter while driving but as I described earlier much of the water that enters the vents ends up on the engine since: a. the hood plastic piece does not align perfectly with the engine side HVAC piece; and b. the HVAC drain only works when the van is parked on a level surface or sloping towards the rear of the van. Also, I dont trust that plastic part that directs water from the wide vents to the HVAC intake on passenger side is watertight or will be watertight.
I have checked under the hood of the van a few hours after driving in a rainstorm and it is mostly dry. I think that any wetting while driving dries very quickly w due to the heat from the engine and the airflow from speed and the dual fans. On the other hand I have checked under the hood of the van several days after a rainstorm when the van was not driven and it was still wet with puddles anywhere they could collect. I theorize that the water that collects when the van is standing still is much more harmful than water that collects while driving. It is the cool dark high moisture environment for long periods of time that worries me the most. All vehicles with a grill get water in the engine compartment while driving in a rainstorm, they are designed for this. Commercial operators and those that drive daily probably will have less of an issue since driving dries out the engine compartment. My van only leaves my driveway about once a week, sometimes much less.
I dont think the hood cowl is 100% solution. Ive already had dealer replace the cowl with upgraded version with soft plastic where it meets the windsheild, sealed the cowl with sealant and tape to windsheild, added weatherstripping to the corners of the hood, and regularly clean out the drainage ports. The engine compartment is still wet after a rainstorm with no driving with puddles in places. My next step will be to shape an engine cover out of aluminum heat shield material. If none of this works, maybe I should sell my gasser, buy a diesel and move to the sonoran desert. Im pretty sure doing nothing is not the answer.