Front Evaporator leak

[1FAT201]

Hi guys. Sorry if this has been asked, but I have searched and searched to little/no avail.
My 200 Series is leaking water from the seal where the evaporator meets the drain going through to the outside of the tunnel. The Drain has been unblocked, but the issue remains, resulting in water seeping down the back of the drain and into the seam of the tunnel which then channels down either side of the tunnel into the footwells. I know it's not a windscreen/roof rack leak, as you can physically feel the water at the job and is been hot 35°C here, with no washing or rain.
My question is how do I get to the seal to either replace it, or am I able to wrap it in silicone tape or silicone sealant?

I'm a bit devastated as I've only had the car 3 weeks and as the previous owner barely drove it, the issue didn't present itself prior.

Thank you in advance.

 

[CharlieS]

That doesn't make sense. If it is draining freely, then there is no realistic way for it to back up and overflow at the place where it joins. You may trust your dealer, but I I was taught to trust but verify.

 

[1FAT201]

That doesn't make sense. If it is draining freely, then there is no realistic way for it to back up and overflow at the place where it joins. You may trust your dealer, but I I was taught to trust but verify.

Like I said before, Toyota have done the poke a cable tie up the drain to unblock it thing, but it still isn't draining correctly. There's no easy way to get to it, and I'm now thinking it's Dash out to fix the issue.

 

[afgman786]

can you snake the bore scope thru the drain to the join? If it's clear why not take that path if it's easy to get to?

 

[1FAT201]

can you snake the bore scope thru the drain to the join? If it's clear why not take that path if it's easy to get to?

I'm not sure how big the opening is. It's due its 200k service, so when it's on the hoist I will see if there's room, but toyota had to remove part of my exhaust to get a cable tie in there, so don't like my chances.