Both Driver And Passenger Side Floor Is Wet

[vikasintl]

We have 1989 GMC S15 sierra and its 2.5 L automatic with AC

 

We have not turned on AC in last month since we own it...

 

Both driver and passenger side floor are wet..under the carpet..you cant see unless you fold the plastic carpet..

floor and insulation both wet..

 

what could be the reason and what is the solution?

 

Its not raining its still summer in WA state

[Jsdirt]

It's either condensation from a plugged evaporator drain tube for the A/C ... or the heater core just blew. Sounds like it's probably the drain tube since your getting some on the driver side too.

[vikasintl]

It's either condensation from a plugged evaporator drain tube for the A/C ... or the heater core just blew. Sounds like it's probably the drain tube since your getting some on the driver side too.

 

Thanks...how do I check drain tube? can you point me to some image or video something..

I can't even locate that drain tube?

 

also if its plugged drain tube how much water will it come to floor? on both driver and passenger side?

 

not much right? here I see a puddle ...and we have not turned on AC for a month ..it can still create condensation?

[Jsdirt]

Alright ... if your not using the A/C, then it had to come from somewhere. Do you use the defrost often? That activates the A/C to remove moisture from the air ... the theory is it will clear the windshield quicker. So if you use defrost often, then the drain tube might still be an issue.

 

Usually you'll find the drain tube on the passenger side, right under the condenser/blower motor housing. You'll have to get under there with a flashlight. It's just a short, black rubber tube coming out of the plastic housing, right up against the firewall.

 

Do you use touchless carwashes? If so, you could have a leak around the windshield, or thru the body somewhere above the firewall but below the base of the windshield.

 

Are you losing coolant? That would indicate a heater core issue.

 

Over the net it's tough to guess what your problem might be - could be any of, or all the above.

[vikasintl]

Alright ... if your not using the A/C, then it had to come from somewhere. Do you use the defrost often? That activates the A/C to remove moisture from the air ... the theory is it will clear the windshield quicker. So if you use defrost often, then the drain tube might still be an issue.

 

Usually you'll find the drain tube on the passenger side, right under the condenser/blower motor housing. You'll have to get under there with a flashlight. It's just a short, black rubber tube coming out of the plastic housing, right up against the firewall.

 

Do you use touchless carwashes? If so, you could have a leak around the windshield, or thru the body somewhere above the firewall but below the base of the windshield.

 

Are you losing coolant? That would indicate a heater core issue.

 

Over the net it's tough to guess what your problem might be - could be any of, or all the above.

 

is it possible that drain tube is missing and that's why I can't find it?

how else I can check?

btw ...do you think that previous owner has kept this truck in yard and over the time it has accumulated water under the carpet? we recently bought this truck about a month ago and we have no idea what previous owner did to this truck?

[Jsdirt]

Actually on that vehicle it's just a hole or 2 at the bottom of the evaporator case if I remember correctly. Might be able to reach down there with an angled nozzle & blast with compressed air. I'd check to see if there are any leaks first, as that's the easier test. The best way .. which of course is NOT the easiest way, would be to open up the evaporator case & physically clean inside .... but you don't want to go there unless your 100% sure it's condensate dripping into the cab. From what you've stated so far, it now sounds doubtful.

 

Now when you say wet, I was thinking a puddle ... but if it's just dampness, that's usually from temperature/humidity swings & what gets tracked in on your feet. Happens to just about all of them with carpet ... and especially so if there weren't any floormats for a length. of time. Not much you can do to prevent that, but you could POR-15 (or equivalent) the floorboards so they don't blow out from rot. If your going to go through all that trouble, might as well toss a new carpet & padding in too.