found water under floormat drivers side? - Dodge Cummins Diesel Forum
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post #1 of 25 (permalink) Old 10-31-2011, 08:50 PM Thread Starter
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found water under floormat drivers side?

96 dodge cummins 307k..I've found that under the mat on the drivers side is soaked? the factory installed insulation is soaked under the floor mat. any ideas? truck never has been hot

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post #2 of 25 (permalink) Old 11-01-2011, 12:18 AM
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my truck did the same after driving in some hard rain for a day (700+ miles), not sure the root cause yet, thinking a leak under the cowl.

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post #3 of 25 (permalink) Old 11-01-2011, 10:10 AM
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Usually it's the third brake light seal that is leaking, The water will then run down the drip rail inside the cab and pool on the driver side floorboard.

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post #4 of 25 (permalink) Old 11-01-2011, 07:22 PM Thread Starter
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Originally Posted by turbo-max View Post
my truck did the same after driving in some hard rain for a day (700+ miles), not sure the root cause yet, thinking a leak under the cowl.
thanks turbo, I'll keep ya posted as to what I find..
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post #5 of 25 (permalink) Old 11-01-2011, 07:26 PM Thread Starter
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Usually it's the third brake light seal that is leaking, The water will then run down the drip rail inside the cab and pool on the driver side floorboard.
3rd brake light seal? I'm kinda lost on that. can you give me a bit more TB? Thanks again for the help ps - I vac'ed all the water out and dried out the mat, nothing else yet however ive not driven in any rain yet either..
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post #6 of 25 (permalink) Old 11-02-2011, 11:16 AM
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On the back of the cab the third brake light has a foam seal that is prone to drying out and cracking allowing water to leak in to the cab. I believe it was a dealer only part but wasn't that much $ seemed to have solved my problem

1996 extended cab manning motor sports 63/68/14 , PDD budget builder 5x.014 injectors,.024 delivery valves, 4gsk, AFC mods, Mack rack plug,timing @ 17*Head studs Isspro gauges and AFC Live. PDD turbo tuner
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post #7 of 25 (permalink) Old 11-02-2011, 12:56 PM
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Originally Posted by TB1 View Post
On the back of the cab the third brake light has a foam seal that is prone to drying out and cracking allowing water to leak in to the cab. I believe it was a dealer only part but wasn't that much $ seemed to have solved my problem
good to know, i will check mine, thanks!

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post #8 of 25 (permalink) Old 11-02-2011, 12:58 PM
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my cab was cracked in 3 spots on the top back, my rear window was improperly installed from the factory and had gaps i could see through, and my heater core was leaking. does the water feel sticky and smell sweet? or does it have a water musk smell? the 3rd brake lights do have issues as well.

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post #9 of 25 (permalink) Old 11-02-2011, 05:35 PM Thread Starter
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my cab was cracked in 3 spots on the top back, my rear window was improperly installed from the factory and had gaps i could see through, and my heater core was leaking. does the water feel sticky and smell sweet? or does it have a water musk smell? the 3rd brake lights do have issues as well.
well im not real sure at this point what it is. I dont think its antifreeze. seems to be musky water. core has not ever shown any signs of leaking

Thanks, Charlie.. 96 dodge cummins stock-308k
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post #10 of 25 (permalink) Old 11-02-2011, 05:52 PM
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Is it the rear passenger or front floor mat? This will make a difference. Yes the rear light can be leaky to that extent. You should have a fan or a heater of some sort blowing on the carpet to help prevent rust. The longer it sits with water the more probe to rust damage it will be.

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post #11 of 25 (permalink) Old 11-02-2011, 07:44 PM
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Mine was the front driver side and I do have an extended cab... it ran along the drip rail inside the cab to the driver side front as it's the lowest point in the cab. Also from past experience when the heater core goes the passenger side floor will get wet

1996 extended cab manning motor sports 63/68/14 , PDD budget builder 5x.014 injectors,.024 delivery valves, 4gsk, AFC mods, Mack rack plug,timing @ 17*Head studs Isspro gauges and AFC Live. PDD turbo tuner
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post #12 of 25 (permalink) Old 11-03-2011, 08:57 PM
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Mine was the front driver side and I do have an extended cab... it ran along the drip rail inside the cab to the driver side front as it's the lowest point in the cab. Also from past experience when the heater core goes the passenger side floor will get wet
It is your ac condensation dripping back into your cab, all disgrace do this there a seal that drys out. What you do is cut a 6" piece of garden hose and put it on the end of the ac drain that is located on the fire wall in the inside of the engine bay

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