We’ve had the same problem. Got the car from my
85 year old mom. Had a strange odor when we got
it which she thought had appeared after she had a
bag of fertilizer spill in her car. She had always
garaged it and probably didn’t drive in the rain
whenever she could avoid it. My son drives the car
and it is now parked outside. We’ve had an insane
amount of rain here in California this past winter.
The carpets started to get soaked. After googling,
we decided it must be from a clogged sunroof
drain. My husband did his best to clear it and we
lifted the carpet and used fans for days trying to dry
it all out. Finally got it dry, only to have it rain again.
I went to move the car and made a U-turn in front
of our house and heard the horrible sound of
sloshing water. We then brought it to a Toyota
dealership (labor cheaper than Lexus). We thought
we hadn’t cleared the drain completely and they
knew just what to do. After clearing the drain, they
drove the car through the car wash to find that it
was still taking on water. They followed the leak and
took apart the back to find that the car was
“coming apart at the seams.” Not quite as bad as it
sounds. There are seams right above the two arms
of the trunk hatch. These couple-inch seams were
never welded. We were told it was a manufacturer’s
defect. Hardly seems possible that the huge
amount of rain was coming through there, but that
seems to be the case. We were told to take it to a
body shop to have it welded. We may try silicon
caulking first and see if that does it.
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