air conditioner leaks water on 2004 Toyota Matrix

There is water in the front and back passenger floor. I assume that it is from a plugged air conditioner drain. How do I find it and fix it?

by in Potomac, MD on July 28, 2009
3 answers 12 comments
ANSWER by on July 28, 2009
The heater box is on the passenger side of the dash. Open the passenger door, kneeling in the passenger door opening look with a flash light at the bottom of the heater box there is usually a little black rubber hose that allows water caused by condensation on the evaporator to drain out into the engine compartment at the firewall. I suspect a passenger has inadvertently knocked of the hose from its attachment at the fire wall or heater box.
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COMMENT by on July 29, 2009
Thanks so much autotechpat!!!! I can't wait to tell my husband that I fixed it when 2 repair shops couldn't. You are awesome! Victoria
COMMENT by on July 31, 2009
you are very welcome thanks for your encouragement!
COMMENT by on June 26, 2010
you're awesome! fixed my problem!!
COMMENT by on July 13, 2010
Thank you!! Considering duct tape to make this fix more permanent. Does not look like a hose clamp will work. Amazing how much water comes thru there.
COMMENT by on July 25, 2010
I have a very similar problem on my 2006 Corolla. The driver side front and rear floorpans are completely soaked with water however the drain tube on the passenger side is and has been in place the whole time. we have had no rain to speak of in the last week so what could be the cause?
COMMENT by on August 12, 2010
You just fixed my 2007 matrix. Wet floor panels passenger side. Thanks so much!!!!
COMMENT by on January 04, 2011
Could this also be the case if it's the rear passenger floor? It's not at all in the front passenger...
COMMENT by on July 12, 2011
Patrick, awesome and easy fix to a big problem Thanks again
COMMENT by on July 15, 2011
Great help as we have been going crazy with the water build up. I suspected a clog problem and your advice was right on as the hose was pulled off and dripping away. I pushed it back on and now will begin the drying process. By the way the hose on our 2004 Martix is all the way on passenger left side about 1/4 way down and really not behind the heater box. I had to pull carpet down to find hose but if you know where to look that won't be necessary. Thanks again!
COMMENT by on July 30, 2011
A previous reply said that reconnecting the tube didn't fix the problem. Other forums point out (1) it might be clogged; clear it (a) by flushing the tube using water, starting at the a/c intake [is this safe??] or (b) clearing it with a small wire hook; (2) if bad odor is developing, (a) use outside intake rather than recirculate for the last few miles of trip and/or (b) spray a disinfectant into a/c vents.
COMMENT by on August 16, 2011
Hello! My wifes's friend has a 2006 Toyota Matrix that was having the same problem as others in this post. Namely, the water appearing on the passenger floor. Thanks to your advice to others I checked under the carpet and guess what?? The "Little L shaped Hose was disconnected from the heater box!! Thanks to you we saved $435.00 which is what we were going to pay for a "Heater Core". Greg, Sacramento, Ca. God Bless.
COMMENT by on August 17, 2011
Thank you so much! Your advice made it possible for me to fix the problem in less than 2 minutes. Amazing!
ANSWER by on May 30, 2010
I had the same problem with water on the passanger side floor. I told my husband how to fix the problem thanks to your advice!! We had a bet on who could find the sloution. I WON!!!! Thanks again. CS - OHIO
ANSWER by on July 06, 2010
I had the same problem of water soaking the floorpans on the passenger side. I had suspected it might be an air conditioner leak and the posts I read here confirmed my suspicions. A quick check showed your predictions to be true - the hose had been knocked off the heater box drain. Looks like it will happen again, given the exposed nature of the hose, but I now know it's a 30 second fix. Thanks for the posts.
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