Wet rear driver floor after the rain

yes, in the gen II. not sure i've read it in gen 3. you'll probably have to sit inside with someone hosing the car down. known leaks are in the rain gutter welds, body seams, rear hatch hinges. you may want to check your door and window seal areas. maybe windshield gasket.
if it was the a/c, i would think rain would not affect it.

 

IIRC, there are grommets (or plugs) which should have been attached to the underside of the car by the dealer during the pre-delivery inspection. This might be something to check into.

 

From the pre-delivery checklist:


I don't know exactly where the plugs go, but take a look around where the mat is located. If there's a hole with no plug, good chance it's your problem.

 

Are you the original vehicle owner? it is pre-own, second hand? If the last apply to the case, the vehicle may had been in an previous accident and some things had been left overlooked like a cracked floor pan, uncovered drain plugs, probably the vehicle was totaled by an insurance claim by body damage and had been repair half the way........to many ifs

 

Those issues are not unique to any car in general but just a pain to pinpoint where. If it were the AC the problem is almost always the right front area where the AC discharge has to go. Its either the heater box has gotten full and water has leaked out or the hose has deflected and instead gone to the floor mat area . But this case it is not the AC system. Many times the door seals get replaced but next rain..water enters cabin again. You can hose the car roof and see if there is leaks. But it can also be a harder one which the water leaks in via the A pillar, goes down to the left side kick panel then proceeds to the left rear door opening then leaks down onto the floor.
On YouTube check out water leaks in a 2001 Lincoln Towncar which shows you how this works. Not saying that it exactly what willhappen on the Prius but you will get an idea how water enters and how it seemingly avoids many obvious areas but ends up showing up in an area which can befuddle you! But I suspect you have to start with the left side cowl area as the point of entry.

 

Is that for all states? I think my dealer said that was for up North. LOL Mine are probably not installed on 3 cars.

 

Since it doesn't rain in Florida I would believe your dealer.

 

no idea, but if it is, it's the first report i recall.

 

are sure it's not a missing rubber body plug? my kid lost one in a yaris and had wet floor in different corners depending which corner was downhill. she lost hers by bottoming on a speed bump, but didn't fess up and it took almost a year to find up.

 

Here's the plug loc's:

 

water infiltration is the worst, house or car. have you hosed her off yet?