Where can you check for a rainwater leak in your 1998 Toyota Sienna that appears on the front floor only does nothave to be moving to get wet and shows no other trace of water anywhere?
If you have a sunroof I had the same problem on our 2001 XLE. It
drains through the windshield front frame which gets clogged over
time with decayed material ( my wife was parking the car under
trees). The water comes in from the sunroof track as it can't drain
properly. You have to get the dealer or whoever to blow out the
material with compressed air. I saw the gunk come out. Look under
the van and you will see the drains. We also had a factory
installed wind deflector which I took off.
You didn't mention whether this was rain-related or not. If it
isn't, your air conditioner drain line may be unhooked under your
dashboard so your a/c may be draining inside. That happened to me
and the floorboard on the front passenger side kept getting wet.
After I fixed the drain line the problem was solved.
I don't buy the AC drain line answer. My Sienna has the same
problem, on both sides at the front. The carpets are soaked and
smelling like a wet dog after every heavy rain. I read somewhere
else that loose or missing air-duct covers may be the culprit for
rear rain-water leaks and tend to believe that could be possible
for the front too. Another possibility is that the plastic molding
that contacts the base of the windshield is missing a bolt and a
bit loose on my unit. So I may try to caulk and tighten that (in my
infinite spare time of course). Then I will definitely look a bit
closer at the Odyssey before my next purchase.
Have you ever been in the car when it was raining and the water was
coming in? Where it comes in and when it comes in can make
answering your question easier. I have this problem repeatedly with
my 2003 Sienna XLE. Water comes in around the sunglass holder, the
molding at the roof on both sides and at the molding at the bottom
of the door. I have had to bring it in more than once for repair
and it is time to bring it in again. In my case, it is the sunroof
and the clogged drains. The last time it got so bad that they
couldn't blow them clean and had to drill them out (I think they
got full of sticky tree sap). Unfortunately, I can't help where I
park so I need to bring it in to be cleaned out every 6 months or
it becomes a bigger job. They have recommended that I remove the
wind deflector in the front of the sunroof to help alleviate the
problem, but I stubbornly keep it on.