Question about 2004 Chevrolet Malibu

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Water on floorboard on passenger side I don't think it is from rain.

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  • 169 Answers

It could be that the condensation drain line is blocked and backing up into the car - but; it is more likely that your problem is a result of a poorly designed cowl cover over the blower fan for your air conditioner. this is a VERY common problem on 97-03 Grand Prix's as well as Malibu's and Impalas through '04. The other side effect of this is that water draining into the blower fan WILL cause it to fail eventually - this solution eliminates that risk.

Here is the cowl (pictures from an '04 Impala, FYI, but are identical):
water on floorboard on passenger side - d459ff7.jpg
You will need to remove it by pulling the retaining clips up - there is 1 on each end, and then one towards the top that has a slot in it. Be careful to not break these or lose them.

Remove the cowl, and underneath you will see the blower fan:

42f0c7e.jpg
Under the cowl you will see a rubber seal that is indicated by the arrow - this is the poorly designed "drip edge". You can either remove it - or leave it in place; the new diverter will accumulate any moisture captured by this seal and divert it properly.

Here is a picture of the part you need - which can be purchased from any GM dealership for about $4 - the GM part is #15794785. Most dealerships don't stock it - but they can order it for yowater on floorboard on passenger side - 1e4d9df.jpgbr /> 1e4d9df.jpg
It simply sits in place as noted by the arrows - you'll notice there is a long extension from the left side of the part - this is the "finger gauge" - you want this to be positioned as far towards the left (as your facing the motwater on floorboard on passenger side - 5cc4d0e.jpgenger side) of the vehicle as possible.
5cc4d0e.jpg
Here water on floorboard on passenger side - 589f077.jpgup of the gauge to give you perspective on how it should be positioned:

589f077.jpg
This is awater on floorboard on passenger side - 2ec9540.jpge drain area that the new diverter will use - instead of dumping water into the blower fan like the old design.

2ec9540.jpg
You can simply use a utility knife and a pair of pliers to score and snap these pieces off.

b67ac22.jpg
65a56ed.jpg
What the underside of your cowl should look like after removing (lines indicate where plastic was removed)

19b73aa.jpg
No you can simply replace the cowl, and reinstall the retaining clips - and you are all done.

Hope this helps - be sure to rate it and comment! ;)

KC GTO Dad

Posted on Sep 24, 2009

  • Doug Miles Nov 29, 2011

    Thank you Shannon! Your explanation and pictures make the solution amazingly clear and doable! I rate it as a 98 out of 100 possible points. In the Malibu, do you have to remove the windshield wipers too (by removing the nut holding them on) as in other cars?

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The vent line for the a/c is blocked, so the car is releasing the condensation drops in the care instead of outside. Mike. Rate 100% and respond back please.

Posted on Sep 24, 2009

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Posted on Jan 02, 2017

  • 91 Answers

SOURCE: floor board on passenger side door gets wet when it rains. i am sure a vent drain is clogged

i think you need new rubber moldings around your door

Posted on May 12, 2009

  • 1 Answer

SOURCE: fluid leaking onto the front passenger side floorboards.

2004 TB 60,000 miles. i was just told that the leaking fluid in my passenger side floorboard was do to a clogged up A/c hose. An A/C works by drying/ removing the moisture from the air inside the vehicle and cooling it. The accumulated fluid is usually evacuated under the vehicle which is what you see when people are stopped at a red light and there is dripping under their car. when a hose is blocked there is a vent that from some reason flows directly into the passenger side floor board. If you can not manually knock loose the block your probably going to have to take it to a mechanic.

Posted on Jun 14, 2009

  • 7 Answers

SOURCE: Leak in back seat passengerside floorboard

air condition drain valve is clogged

Posted on Sep 29, 2009

johnjohn2
  • 5763 Answers

SOURCE: Water leak on passenger floorboard also an ac problem

sounds like your a/c-heater box drain is clogged ,easy fix just stick a hanger in hole to clear, you will see water run out,now for the blower it a blower motor risistor, this controls the speeds and goes bad alot common problem . good luck.

Posted on Oct 10, 2009

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