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I have a 2003 rx. Which has developed a leak in the corner of the rear near side footwell.l know the sunroof pipes can get blocked but my roof is sealed to prevent it leaking

any ideas where this leak is coming from please 

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Hi Bob and welcome.

Have a search through the RX section and you'll find leaks are discussed. Don't limit yourself to the 300, the 400h sometimes suffers too.

I'd double check the sealed sunroof but also check the roof rail feet where they're fixed to the roof (easy to remove and reseal), seam welds around the tailgate and obvious stuff such as glass seals. Too far forward to be rear light seals.

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When you have an hour to spare, read this thread... it's possible that the membrane behind your rear door card has been messed with or a door seal gone etc... but water will settle at lowest point, so wherever you are experiencing water, the rear boot of the RX is probably the source because it can run from the boot into the cabin...see my write up below.

So....I was aware of the RX leak problems before I purchased my RX300 last month which indeed came with wet rear footwell carpets. The history showed Lexus had already had a go at fixing water ingress in 2014 swapping out the rear light gaskets.

I tested sunroof drains, they were OK and clear, sealed up boot lid hinge plate bolts...

I stripped out the rear boot floor/plastic trays etc. I sat in the boot of the car when it rained and watched water seeping in along the seams at back under boot lip exactly as per pictures on the last page of the above thread posted in March 2018 by 'Steve.ch'. No water came in from rear lights, so that was one possible ticked off the list.

Looking in the stripped out boot, I could see how water coming in could find it's way to the cabin carpets via gaps on each side of the 3 or 4 inch high crossbeam/bulkhead running just behind the rear seats. I had an idea!!!! I wanted to have a go at fixing the leaks in time, but I wanted dry carpets much quicker than that. So, a 'managed coastal erosion' kind of thing sprung to mind. I filled the gaps each end of the crossbeam/bulkhead with expanding foam, once dry, I sealed over with bathroom silicone sealant which I also ran along the seams the of crossbeam and in it's holes. My aim was to prevent water reaching the cabin from the boot. Secondly, there are several small rubber grommets covering 5mm-ish holes in several places in the boot floor. I removed these, now water can come and go as it likes without wetting the carpets.

I put everything back together and dried out the rear carpets as much as possible with swapping over towels with weights on them to sponge up the water... I also had an 8 hour drive to do over Xmas, so did this with heating on full aimed at the floor, sunroof open to vent the moisture (luckily no rain)

It's worked... the rear carpets are dry even after heavy rain. I can lift out the plastic trays and see only a cup full of water accumulates at the back of the boot after rain (our drive has a slope and I park rear down... old habit from the LS) before it runs out of the holes.... and now after the long drive, with no rain, the boot is bone dry because it's also getting ventilation via the opened grommet holes.

I might get round to fixing the actual source of the leak, but no rush now!

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Given both my LS suffered leaky boot syndrome (easily fixed), and the situation desrcibed here, it amazes me given that Japan has twice the rainfall of the UK, how the heck can Lexus owners manage in Japan when their cars get a little older.

My dads 20 year old Peugeot 406 (and when my wife had a 15 year old Honda) never had a leak in their lives!!!!

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19 hours ago, Cotswold Pete said:

Given both my LS suffered leaky boot syndrome (easily fixed), and the situation desrcibed here, it amazes me given that Japan has twice the rainfall of the UK, how the heck can Lexus owners manage in Japan when their cars get a little older.

My dads 20 year old Peugeot 406 (and when my wife had a 15 year old Honda) never had a leak in their lives!!!!

Well, the LS felt positively watertight to a depth of 30m in comparison to the RX sieve. :wink3:

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On 1/4/2020 at 12:39 PM, Stupot said:

how the heck can Lexus owners manage in Japan when their cars get a little older.

I have a friend who lived and worked in Japan for many years and he once told me a lot of Japanese like their cars to be nearly new... so they probably never get to the leaking experience and why there is such a healthy export market from over there.

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All RX 300's must be the same as regards water leaks - had a deja vu moment when reading Stupot's experience lol. Since removing bungs, creating a dam between boot and pasasenger area and drilling some strategic drain holes, all is well. Took a while to get carpets dry though.. Shocking for what is meant to be a quality car though, and i don't think I'd have another.

 

Pete

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On 1/3/2020 at 11:56 AM, Bobgauntlett said:

I have a 2003 rx. Which has developed a leak in the corner of the rear near side footwell.l know the sunroof pipes can get blocked but my roof is sealed to prevent it leaking

any ideas where this leak is coming from please 

Any progress on your leak?

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