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03 Senoma Leaking Water In Floorboard?

leeo5150

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leeo5150 Enthusiast

leeo5150

Posted
Posted

First timer here. I just bought a 2003 GMC Senoma with 100K miles. I've noticed that everytime I drive it the driver's side floorboard fills with water. It's clear water only, no antifreeze or anything else. It also hasn't rained in days so it's not a leaking door seal or the windshield. Anybody have any ideas? Thanks

txab Senior Enthusiast

txab

Posted
Posted

Are you running the A/C?

 

Are you sure it's not coolant?

 

Are you driving through water puddles?

leeo5150 Enthusiast

leeo5150

Posted
  • Author
Posted
Are you running the A/C?

 

Are you sure it's not coolant?

 

Are you driving through water puddles?

 

 

Not running the A/C, only the mixed heat (floor and defrost). It appears to be only water, and no puddles.

txab Senior Enthusiast

txab

Posted
Posted

When you say "fills with water", how much water? Is it just damp? Is it squishy? Or is it sloshing?

 

Well it can't be too many things.

 

Rain

Coolant

A/C condensate

Water splashing from road

 

OR

 

You, are leaking. :sigh:

 

You're sure your coolant level is OK?

 

Have you used your windshield washer prior to seeing this water?

00Silverado4x4 Senior Enthusiast

00Silverado4x4

Posted
Posted
Are you running the A/C?

 

Are you sure it's not coolant?

 

Are you driving through water puddles?

 

 

Not running the A/C, only the mixed heat (floor and defrost). It appears to be only water, and no puddles.

 

 

 

When you are running in any Defrost mode you are also running the A/C Compressor to help remove moisture from the air that is being blown onto the windshield. I used to have an 04 Sonoma and remember reading about that in the manual. From what I've read about that problem it is possibly A/C condensate that is being dribbled into your truck. I think there was a reroute procedure for the drain if I recall. There are some knowledgeable techs on here that could look to see if there is any TSBs for your truck concerning the problem.

leeo5150 Enthusiast

leeo5150

Posted
  • Author
Posted

You're right, I may be leaking!

 

It's enough water to coat the whole floorboard and slosh around a bit.

 

I just went and checked the truck and there is still some there from the last time I drove. It is completely clear, has no smell and is neither greasy or sticky. It appears to be just water. But I haven't hit a puddle or ran the A/C, only the heat and there's coolant so I don't think heater core.

 

Haven't used the windshield washer, the coolant level is fine and if it helps any my last trip was less than 2 miles.

leeo5150 Enthusiast

leeo5150

Posted
  • Author
Posted
Are you running the A/C?

 

Are you sure it's not coolant?

 

Are you driving through water puddles?

 

 

Not running the A/C, only the mixed heat (floor and defrost). It appears to be only water, and no puddles.

 

 

 

When you are running in any Defrost mode you are also running the A/C Compressor to help remove moisture from the air that is being blown onto the windshield. I used to have an 04 Sonoma and remember reading about that in the manual. From what I've read about that problem it is possibly A/C condensate that is being dribbled into your truck. I think there was a reroute procedure for the drain if I recall. There are some knowledgeable techs on here that could look to see if there is any TSBs for your truck concerning the problem.

 

 

I think you may be on to something. I just drove it for a while with the defrost off...and no water.

tyhuck Senior Enthusiast

tyhuck

Posted
Posted

Well, you can run a test.

 

Run the heat without the defrost. If you still get water, its not the compressor.

 

As mentioned above, the A/C compressor is still running when using the defroster. This is to remove moisture from the air. Otherwise, it would not remove fog, it would make it worse. Thats why you get fog on the windshield when the heater core is leaking.

 

If thats not the problem, then run the A/C on cool and see what happens. If you stop getting water, then its a leaky core.

leeo5150 Enthusiast

leeo5150

Posted
  • Author
Posted
Well, you can run a test.

 

Run the heat without the defrost. If you still get water, its not the compressor.

 

As mentioned above, the A/C compressor is still running when using the defroster. This is to remove moisture from the air. Otherwise, it would not remove fog, it would make it worse. Thats why you get fog on the windshield when the heater core is leaking.

 

If thats not the problem, then run the A/C on cool and see what happens. If you stop getting water, then its a leaky core.

 

 

Thanks for the tip, I'll try it tomorrow.

leeo5150 Enthusiast

leeo5150

Posted
  • Author
Posted
Well, you can run a test.

 

Run the heat without the defrost. If you still get water, its not the compressor.

 

As mentioned above, the A/C compressor is still running when using the defroster. This is to remove moisture from the air. Otherwise, it would not remove fog, it would make it worse. Thats why you get fog on the windshield when the heater core is leaking.

 

If thats not the problem, then run the A/C on cool and see what happens. If you stop getting water, then its a leaky core.

 

 

I just ran to the store, about 3 miles round trip, and ran only the heat and no defrost. When I got home, water in the floorboard.

silverado5300 Enthusiast

silverado5300

Posted
Posted

Thank you for posting this, my 96 s-10 had the same problem, if it would rain or not i would have an inch of water only on the drivers side floorboard and no one ever had any answers, only telling me they had the same problem :sigh:

  • 2 weeks later...
AirForceAngler Enthusiast

AirForceAngler

Posted
Posted

You have to be getting condensate from somewhere, most likely the A/C condensor or evaporator, can't remember which one is under the dash.

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