Go to any car show,I can almost garentee not one Owner of those classics runs their car through a auto car wash. Self serve in winter power wash with wand to get salt sand off when temps are above 32.
Had same issues with wife’s explorer, turned out be check valves under front wheel wells,partially clogged would drain when tested.hard rain would overcome drain leak into passenger side floor pan clogged up with sand dirt,cleaned retested seems ok now,I don’t know if our trucks have same check...
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