My 1998 Chevy Express 2500 12 passenger Van has water leaking onto the rubber passenger floor mat when it rains. I have shop vacuumed the cowl under the cowl grill but cannot tell where the water is supposed to drain. When I pour water in the cowl I can see it leaking out under the hood at seams in the cowl duct (?) The water does not come into the van if it is parked on a hill, nose down. When I move the van to a nose up position water drains onto the rubber mat on the passenger side. Is there any way to verify that the cowl drain is plugged/unplugged other than to pour water in the cowl and guess?
What makes this problem better or worse?
Heavy rain
How long has your 1998 Chevrolet Express 2500 had this problem?
Probaby 6 months - but not observed unless we have a lot of rain
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if it's been doing it for 6 months,then it's possible that the A/C condensation drain is clogged. if water is not draining,making a puddle under the Van when running the A/C,then the drain is clogged and draining in the pass side floor.
I had exact same problem recently, 2006 express 3500. Out of desperation, I poured draino type drain cleaner into the cowl during a light rain. Problem gone in like 5 minutes.
