I bought a 2000 caravan a few months ago, every time it rains water pours in from under the glove compartment on the passenger's side. I can reach my hand up into a tunnel like opening under that area. I think that a part might be missing.

Question edited for clarity, add maker.
Question moved to model category.

Based on our research the RAV4s with wet floors are usually, but not always, clogged sunroof drains or drain outlets. Other RAV4 owners found that the body trim surrounding their windshield or even the fender panel had degraded and failed, allowing water to seep in during heavy rain.
Aug 12, 2015

If the passenger floor of your RAV4 is wet - here is the fix

Torque News https://www.torquenews.com > if-passenger-floor-your-r...

Wet Passenger Floor

Toyota RAV4 Forums https://www.rav4world.com > ... > 4.3 Mechanical
Sep 26, 2015 - After a few years, some foam will start to stiffen up and allowing water to seep past them allowing the water to pool around the opening.

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I have 2005 mustang and had the same problem 4 yrs after I bought my .Mustang when it was still under the warranty I took it to the dealer where I purchased vehicle.They charged me $150.00 to change the cabin air filter they said the old one was blocked with leaves and suggested not to park vehicle under trees which is kind of hard to do when I live on a street with a lot of trees. Everything was fine until 2 years later it started leaking in passenger side again.Pulled cabin air filter saw no leaves.Of course now warranty ran out .I went on a mustang web forum to find there were other people with same problem and not just a mustang problem there were other makes and models having same problems .One person fixed the problem. Here is the fix. Pop your hood look under where the cowl grill sits on the right and left side there is a rubber drain on each side( hard to see)so feel with your fingers check to see if they are blocked with dirt or leaves if so clean them so water can flow through them when it rains .That is what was causing water to come in on my passenger side right underneath the glove box in my mustang now every few months I check to see if they are blocked I have not had anymore problems with water coming in on passenger side . Sad thing is when i purchased my mustang i wish the dealer would have told me not to park my car under trees so i wouldn\'t have a water I would have thought twice about buying a car that you can\'t park under trees because I live in an area where there is a whole lot of trees.Thanks a lot Ford for designing such a crappy car !!!! Good luck I hope this fixes your water problem.

My first guess would be that the heater core is bad, usually a very hard job to replace.

IF IT WAS HAPPENING ALL THE TIME WATER IN THE PASSENGER FLOOR I WOULD HAVE HEATER CORE CHECKED BUT ONLY WHEN RAINS YOU HAVE A SEAL MISSING UNDER HOOD AGAINST FIRE WALL
SOME TIMES YOU CAN BUY REPLACEMENT ONES AT ADVANCE OR AUTOZONE BUT 2000 MODEL NOT SURE

Heater core needs to be replaced

The "weep drain" is located on the firewall inside the engine compartment. It's only like a 3 or 4 inch tube probally 1/4 to 3/8 in size. Probally has a right angle in it. Use a metal coat hanger to poke up in there and move about. Water will pour out. Or you can take the weep drain out but most people, even mechanics, just poke it open and call it done. Happens all the time on older vechiles, never seen or heard of it happen on this new of one but hey, first time for everything.

There is probably a drainage hole underneath the cowling under your windshield wipers. They're supposed to allow the water to drain out into the wheel well. See if the passengers side is plugged up. Collected water has to go somewhere and it will always find a place.

water dripping from under the glove box area is usally a sign of water in the heating ducts. water runs down the windshield and goes under the cowel, then instead of draining, it some how enters the air intake for your heating system. Take off your wipers, and remove your cowel, you will be able to see the air intake (on the passangers side) and the reason why the water is being directed into it.

pull your carpet up near the leak area and look for muddy body seams. it is possible one of the factory body seams are leaking- possibly in the cowl(under wipers) area, especially if it leaks when the car is sitting. there will be dirt/mud around the seams that are leaking. also you can check door seals by running the car on HIGH DEFROST with all doors and windows closed. spray around with a 50/50 soapy water solution. obviously bubbles will form around your leak.

Maybe. If you have a fixed antenna on that side of the vehicle, the large rubber gromet on the wire leading into the passenger compartment may have come out, allowing lots of rain water to enter the vehicle. Happened on my 94 and flooded the passenger side.