Open hood, look down at radiator area, air intake duct is there. Unless
there was a big "bow wave" no water would reach that intake - and if it
did it would slowly drain from the filter box on the right side of
engine. Paper filter would swell if wetted and should be replaced in
that doubtful event. You can check filter by unsnapping clamps - just
don't allow any dirt to enter engine side of filter.
Actually. we see hydrolock fairly often, especially on 203 & 211
chassis, and from much less than 2 feet of water. The design of the
intake pipe at the top of the grille encourages this. Folks blast
through a few inches of water, some of the huge splash ends up AHEAD of
the car and is sucked straight into the engine, and voila, bent rods.
Another fine design from Dr. Z.
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