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Floorboard front passengar seat in 2000 monte carlo is wet when it rains

The floorboard of the passenger seat only in front of the seat not behind it-gets soaking wet-it even made a puddle this morning....someone says that since it only happens when it rains that it could be my door sealant but i'm thinking the rain causes something underneath the hood to overflow? HELP please

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

motor1258
  • 6674 Answers

SOURCE: 2004 monte carlo leaking water into the interior

Have someone remove cowl or cover to access cabin air filter box area, and clean it out good. Build up of leaves & other debris has been known to cause leaks inside because of drainage plugged.

Posted on Jan 19, 2009

  • 75 Answers

SOURCE: 2006 Malibu

possibly leaves or other trash way down under grille at bottom of windshield

Posted on Jul 03, 2009

KCGTODAD
  • 169 Answers

SOURCE: water on floorboard on passenger side

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):
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 you.

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 motor, or passenger side) of the vehicle as possible.
5cc4d0e.jpg
Here is a close-up of the gauge to give you perspective on how it should be positioned:

589f077.jpg
This is a shot of the drain area that the new diverter will use - instead of dumping water into the blower fan like the old design.

2ec9540.jpg
Now - for the cowl to fit over the new diverter - you will need to trim a couple of pieces of plastic from the bottom of the cowl - as indicated:

d051bff.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

  • 7 Answers

SOURCE: my 05 cobalt is leaking on the passenger side door

Does it do this with the air condition on? Does your car have a sunroof? If you said yes to the first question then a drain line from the air condition is clogged and would need to get it unclogged. If your car has a sunroof then a line that drains any water that gets passed the seal is clogged and empties into your car. You might want to take it to a mechanic and not the dealership. They will charge you an outrages price to fix it.

Posted on Dec 11, 2009

  • 105 Answers

SOURCE: Carpet soaked-can't find leak

hello, make sure the drain line on ac coil is open, my uncle has a astro, with rear ac also, the line for the drain was cloged up also, needless to say his carpet was wet too, also if it has luggage racks on top, pull them off and put small amount of silicone undr the racks where screws go into the top of the van.

Posted on Feb 06, 2010

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My 2000 ford crown Victoria. Have water on the rear passenger side floor. What could be the problem


Hey Grady..
There are few things that could cause the water intrusion... Is the carpet in the front floorboard wet?.. ..Has it rained recently? This will rule out window seals leaking? Have you opened the trunk and checked to see if water is in the trunk? OK..IF it has not rained, no water in the trunk, AND the front floorboards are wet, then the heater core is leaking...
Do It Yourself and DIY Auto Repair by ChiltonDIY
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