Gurgling sound under back seat

Please let me know if you figure out how the water got in..I'm experiencing a similar problem

 

Well, the dealer justed drain my electric battery tray. The sloshing finally stopped. They don't know how the water entered the tray and said they had never heard of this problem before. I assume I'll have to have it done again later.

Dealer suggested not driving through an automatic carwash with an underbody spray!

 

I took my Prius through plenty of automatic car washes with underbody sprays, never had a problem. I would have thought if the underbody spray had caused a problem, the spare tire well would have filled up too

 

Check the rear, cabin pressure equalization flaps. These are rubber flaps that open when the door is closed to prevent 'popping ear drums.' They are located in my NHW11 below the stop lights and behind the bumper.

In theory, if they failed to close or were 'propped open,' water splash could come in that route and into the rear cabin area.

Just a thought, a hypothesis.

Bob Wilson

 

Again if someone has pictures or diagrams indicating the locations of the said plugs or drains or flaps please post. Thanks!

 

I'll try to dig up some diagrams later on

 

Huh, can't find them anywhere. Will keep looking

 

That would make sense for Prius sold outside of North America. The reason I say this is due to the fact the Rest Of The World Prius does NOT use a bladder in the gas tank.

Since the bladder expands and contracts with volume, a Prius driver in North America should never hear fuel slosh

 

well Im located in Cyprus, so I guess the sloshing in my case is explained ?

 

Yep, but just to be safe, remove the rear tray and check out the spare tire well. If you see even a hint of water in there, investigate further!

I had a 1992 Honda Civic from new, but sold it a couple of years later as I rarely drove it (Still in the Army). If the fuel was 1/2 or lower, I would hear a mild slosh, especially if I stopped and it was quiet

 

Thanks for the effort!

 

I've gone through the All Data stuff, nothing at all. Will try looking at a hacked Prius shop manual I have

 

A long while back in 2007, Evan posted a picture of the HV battery
cooling ductwork here: :cheer2:

http://priuschat.com/forums/care-ma...g/37794-high-hv-battery-temp-cooling-fan.html

Hope this helps.

 

Wow, can't thank you enough. I know this is an old post but it deserves reviving since I expect more people are encountering this issue as thier cars age. It's a bit alarming that the 12V battery was sitting in a deep puddle. Instant cure.

For responders looking for a diagram, the OP explained it quite well. Looking from under the car, behind the rear passenger side wheel is a small integrated metal chamber that houses the 12V battery. From the interior it is accessed through the trunk by lifting the removable floor panel at the rear on the right. I opened this and didn't see anything until I got a flashlight and looked a little deeper...lo and behold, the 12V was swimming.

From below there is only one small rubber plug, closer to the rear wheel than the bumper. It's easily pried out, with either fingers or a small flathead. Be prepared to get wet. Personally I have left the plug out for now.

Thanks again to the OP...I was ready to go to the dealer because I feared something was wrong with the main battery. Would have been interesting to see the labor cost for the 30 second fix!

All the best,
Steve

 

Thank you so much for this. I was going almost bonkers when after I washed my car a few days ago and it rained heavily this past week on my new pre-owned prius, I was hearing this "plop" noise, like water in a milk jug happen every time I braked fast or accelerated fast. I could not figure out why I'm hearing this water noise! I thought my water pump was going bad or something, but it was coming from the back passenger seat.

I pulled the inner plug behind the passenger tire, about a gallon of water came out! I was so relieved!

Anyone else who associates a milk jug noise or "plop" noise or water in behind the rear passenger, especially if you live in a rainy state like Florida, please pull the INNER PLUG behind the right rear wheel. Water will pour out. It must come from water in between the two panels above the rear lights.

 

@Brenz, while it is a good move to drain off the water, you need to trace the source of the leak and seal it.

Quite a few people trace it to a seam under the trim stripe on the sides of the roof that is not sealed properly. See this post and the following 5 or 6 for details: 12 volt battery change and a lot of water under it - Post #8

Although in this post the water accumulates in the battery compartment, there are other threads where the water accumulates in the wheel well, like yours. In these posts they also trace the leak back to the same crack in the seam.

There is a thread on this subject, although more severe, with better pictures here: Water filling driver's side pan.

Hope these help.

 

Yes, I am having the same problem with my 2005 Prius with 125,000 miles on it. Taking it to the dealer tomorrow to see what they know. I will certainly mention this Prius chat page thread in case they have not seen it.

 

welcome! all the best!