Jump to content

Clogged AC drain

TMD
 Share

Recommended Posts

TMD Enthusiast

TMD

Posted
  • Author
Posted
On 7/18/2020 at 9:02 AM, lebag335 said:

How do these get clogged?

I have never had it happen on any other vehicle I have owned, so your guess is as good as mine. I drove less this spring because I ended up working from home - that might have had something to do with it... Seems to me like a problem that should not exist. 

  • Thanks 1
  • 1 year later...
  • Replies 37
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

chadman
chadman

Interesting. They can usually be cleaned out through the drain hole. Would have to be something misassembled or misaligned with it being so new. Dash tear downs usually leave you with squeaks and ratt

batman900
batman900

Any way to prevent this from happening? Anyone have a pic of where to snake from if it does clog?

TMD
TMD

I have never had it happen on any other vehicle I have owned, so your guess is as good as mine. I drove less this spring because I ended up working from home - that might have had something to do with

Posted Images

berge7228 New Member

berge7228

Posted
Posted

I had the same problem yesterday with my 2020 Silverado 5k miles on it. I was able to use a 2' long air gun to blow into the outlet hole from the passenger side wheel well after removing it. the tip has a 90 degree elbow so I was able to get it behind the engine. One quick blast cleaned out the drain and about a gallon of water came out. Took me about 20 minutes and most of that was looking for my air gun I never use.

mbfireboat Enthusiast

mbfireboat

Posted
Posted

I had the same in my Yukon Denali. I could hear water sloshing around behind the dash when I turned and the passenger side floor was wet.

I got a can of aerosol AC/evaporator cleaner that comes with a flexible hose and nozzle. Most auto parts stores have it for around $15-20. I removed the front wheel liner and and squirted the contents into the drain line. It not only clears the drain line but also cleans the evaporator. Worked very well and not that hard to do. 

  • 1 month later...
Pat Palombaro New Member

Pat Palombaro

Posted
Posted

PLease someone take a picture of where this drain is.  I have a 2020 silverado and the mold/musty smell with onlye 8000 miles on it.  I sprayed some Laysol and a mild bleach solution in the air intake and it so far has cleared it up. but i want to make sure the drain is not plugged.  no water in cab but i honestly have never seen the typical puddle under the truck when I park it ?

 

newdude Senior Enthusiast

newdude

Posted
Posted (edited)
10 minutes ago, Pat Palombaro said:

PLease someone take a picture of where this drain is.  I have a 2020 silverado and the mold/musty smell with onlye 8000 miles on it.  I sprayed some Laysol and a mild bleach solution in the air intake and it so far has cleared it up. but i want to make sure the drain is not plugged.  no water in cab but i honestly have never seen the typical puddle under the truck when I park it ?

 

 

 

Best accessed through the right wheel well.  Its a rubber round plug with a short little flapper valve on it.  Just above the right side of the transmission.  Either turn or remove the wheel for best access.  

Edited by newdude
  • Like 1
T-Town-Z Enthusiast

T-Town-Z

Posted
Posted

Mine started to smell musty within a couple months of when I I bought my truck.   The dealership sprayed something in it when I first mentioned it, but it only lasted a few weeks.   I tried the various A/C cleaning foams and sprays but just the same, they are just temporary.  

I now just take out the cabin air filter when it starts stinking and spray Lysol in there while the A/C fan is on, then shut it off a while and let it soak in.  This has been my regular spring, summer and fall routine for the last 5 years !

  • 1 year later...
SMDBIOS Enthusiast

SMDBIOS

Posted
Posted

Nothing in this post even remotely resembles anything on my 2021 5.3 4WD Sierra.

 

Just spent the last hour trying to find the AC drain "Hose" or "Nipple" or whatever you want to call it and cant find it. The location descriptions don't make any sense in relation to my truck,. Nothing on the right side of the trans from front to back of it. The picture thats posted doesn't resemble anything on my truck related to AC hoses or any hoses. There are nipples that are similar but those are attached to wiring harnesses that go thru the firewall.

I did trim up the sound deadening material that was indeed soaked with water at the bottom corner of the front fender so at least I accomplished something.

 

Thanks!

  • 7 months later...
newdude Senior Enthusiast

newdude

Posted
Posted
2 hours ago, Joseph Garris, Jr. said:

2020 Silverado 4.3L.  Is the condensate drain located engine side of the firewall or behind?  I'm struggling to find it...

 

 

watrer.thumb.png.a432bbd96000a6f6dbc367d7a8d7239d.png

  • Thanks 1
Bikerjon Enthusiast

Bikerjon

Posted
Posted
9 hours ago, newdude said:

 

 

watrer.thumb.png.a432bbd96000a6f6dbc367d7a8d7239d.png

Wow! How the f*** do you poke or clear that out when plugged?

newdude Senior Enthusiast

newdude

Posted
Posted
On 7/21/2023 at 11:34 PM, Bikerjon said:

Wow! How the f*** do you poke or clear that out when plugged?

 

 

Our techs usually pull the RF wheel and wheel liner out and go from the side.  

  • Thanks 1
  • 5 weeks later...
Whitetail5 New Member

Whitetail5

Posted
Posted
On 7/2/2020 at 12:24 PM, BlancoSilverado said:

The drain exit is on top of the trans towards the passenger side,

 

I had the same problem. i ended using ozium for the mold and pushing some air though the exit hole (multiple times). 

 

Whitetail5 New Member

Whitetail5

Posted
Posted
2 minutes ago, Whitetail5 said:

 

Exactly how did you find the drain and how did you blow air into drain?

Pictures would help or video.  I've been told it's above tranny on passenger side? Who ever designed this is an idiot for sure

Whitetail5 New Member

Whitetail5

Posted
Posted
On 7/23/2023 at 6:44 PM, newdude said:

 

 

Our techs usually pull the RF wheel and wheel liner out and go from the side.  

I'm thinking this isn't for 2019 or newer models.  

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      I will admit I haven't experimented much with pressure drops beyond the numbers I put in and part of that is that the numbers I used are fairly low and then found out it would trigger regardless at that 35 psi. Having said that I had tried before had changed the placard pressures and being that I have a 1 ton set to 80 on the placard for the rear I believe it triggered close to 60, the front I don't recall now for sure but thought maybe it could get close to 45 from that factory 60 placard pressure. So I never did figure out if it was a number of psi from placard pressure to the alarm or a percentage of the total placard number as some figured it was like a 25% drop from placard pressure would trigger it. So as to try and answer your question, I believe I set the placard pressure on the front to 47 or so and while I run the front tires at 40, they have dipped below that some if its colder and I haven't put "winter air" in yet and never once have had the front alarm go off. I would say that the answer your looking for is no, that if you set your placard pressure to 45, you have a certain amount of room to drop below that pressure before the alarm will go off.    The pressures you decide to run in your truck, that ends up being what makes sense to you based on what your carrying in your truck or if towing, then have to bump them back up to something that will carry the load in the rear and the fronts typically left at the same pressure. It all comes down to that chart I put the link to and using an accurate roadside scale to be your guide, both unloaded and then loaded to know your minimum safe pressures.    I just wish GM would allow a person to change the readings for the tire pressures to the English system of pounds as I have to look at that goofy metric reading that will never ever jive in my head and will go over and change it just to figure out what they are if need be and then change it back. 
    • TrueBlue
      No Software Updates - Old Build

      By TrueBlue · Posted

      That part I understand, that the dealer can do it. But I'm not understanding why updates that were available to the truck since it left the factory, or the dealership originally, would not still be available to it without dealer intervention.   I'm thinking along the lines of recalls. They stay available until they are completed. Why not updates as well, especially since some of those can be safety related also?
    • jgaudet99
      Tire psi

      By jgaudet99 · Posted

      That's good to know, but I don't think I'll even be running them under 45 in the rear  unless it's on the sand or something but will only be for a short distance anyways!    I didn't read all the instructions in the booklet yet, but do you know let's say I set the rear psi on the placard to 45, will the warning light come on soon as it drops under 45 or is there a percentage it has to drop from the set value before the warning light is triggered?
    • newdude
      Would this CV Shaft be bad?

      By newdude · Posted

      That's bad.  Like, its probably destroying the stub axle the CV slides into.   Do you have a proper lift installed with differential lowering brackets?  Did you install AT4/Trail Boss factory CV axles?  
    • PunchT37
      Would this CV Shaft be bad?

      By PunchT37 · Posted

      Hot? New Jersey? Today? I was working on my old 2000 Silverado 1500 today. Believe me, it was boiling hot today. As it has been.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...