1988, C4, I've have this problem with wet carpet passenger side after a good rain. Years ago I found a drain tube located far right side of the heater box behind the air grill that was blocked and after cleaning it thought I had fixed the problem. I'm still having the same problem, does anyone have any knowledge of how the rain water is routed when it enters the air intake, I found one drain tube but there must be another.
Thanks.
Thanks.