I noticed a rather damp smell this weekend coming from my beloved RX

Closer inspection revealed a damp carpet under the drivers seat and under the rear drivers side mat.

I have checked the door rubbers which look fine,

Any suggestions on what could cause this????

Could it be a blocked aircon drain, working its way back to the low point of the floor plan?

Thanks

Not a problem I have heard of before. Check the floorpan for any signs of damage. Maybe you have flicked something up off the road.

Yes. Had this happen a Micra my mother had about 8 years ago.

Yep, I'd check for blockages too! It's happened to me in a couple of different cars I've had.
Especially if you park under trees often.

Yep, I just noticed it in my 03 rx 300 yesterday. Has anyone out there found the culprit, and fixed it. Where would the aircon drains be?
I've also heard that the Windshield wiper grill areas have drains in the front firewall that can get clogged up, causing water penetration into the cabin area, common on a lot of cars, not just lexus, my dads camry had it, really hard to fix, had to remove the dash, to find clogged drain pain, drain hose clogged.

sunroof drains....

they run down A pillar and C pillars