Jump to content

Did GM fix the recirculation issues that plagued the K2XX platform?

SS502

By SS502
in Troubleshooting, Warranty & Recalls

 Share

Recommended Posts

SS502 Senior Enthusiast

SS502

Posted
Posted (edited)

As the title says, did GM fix the horrible recirculation "feature" for the new T1XX? Not saying the T1XX has a problem wondering if they fixed it from the previous platform. I am about ready to trade my almost new (less than 3,500 miles) 2018 Sierra in on something that will allow us to ride without burning eyes and coughing when following (or stuck behind) a vehicle spewing out stink. Seems no matter what setting I select, it is useless.

Edited by SS502
avalonandl Enthusiast

avalonandl

Posted
Posted

Are you talikng about ventilation? I thought GM has some of the best in the business. 

mfennema Enthusiast

mfennema

Posted
Posted
4 minutes ago, SS502 said:

As the title says, did GM fix the horrible recirculation "feature" for the new T1XX? Not saying the T1XX has a problem wondering if they fixed it from the previous platform. I am about ready to trade my almost new (less than 3,500 miles) 2018 Sierra in on something that will allow us to ride without burning eyes and coughing when following (or stuck behind) a vehicle spewing out stink. Seems no matter what setting I select, it is useless.

I cannot comment on the answer to your question, but I have noticed that the smell from other cars (especially people smoking) is much stronger in my 2018 no matter the setting than any previous vehicle I have ever had.

  • Thanks 1
SS502 Senior Enthusiast

SS502

Posted
  • Author
Posted (edited)
6 minutes ago, avalonandl said:

Are you talikng about ventilation? I thought GM has some of the best in the business. 

Yes the ventilation system. Doesn't matter where I set the controls the stench/fumes coming from other cars is horrendous. Drove behind (quite a ways back too) stinky diesel and it just fills the cab...every single time. If the outside air stinks you can't keep it out of the cab. I started a bounty fund for @pgamboato come up with a fix...

Edited by SS502
SS502 Senior Enthusiast

SS502

Posted
  • Author
Posted
Just now, avalonandl said:

There is a Recirc mode.

Yes, I am aware of it and that's what I am talking about...it flat doesn't work. Even GM has admitted it only cuts out about 60% of the smell from outside because they designed it that way to keep dust out which makes no sense to me but they acknowledge that it lets fumes through.

SS502 Senior Enthusiast

SS502

Posted
  • Author
Posted (edited)
4 minutes ago, avalonandl said:

It should be 80/20.

OK...I'm not about to argue about the ratio (GM has posted 60/40) of fresh/contaminated air...the bottom line is it lets too much in. There is a whole section over in the K2XX forums about this problem. I am asking if GM fixed the issue for the 2019 because I will probably trade my 2018 in for a vehicle that has a recirculate function that really works. 

Edited by SS502
  • Like 1
SS502 Senior Enthusiast

SS502

Posted
  • Author
Posted
1 hour ago, SS502 said:

OK...I'm not about to argue about the ratio (GM has posted 60/40) of fresh/contaminated air...the bottom line is it lets too much in. There is a whole section over in the K2XX forums about this problem. I am asking if GM fixed the issue for the 2019 because I will probably trade my 2018 in for a vehicle that has a recirculate function that really works. 

ALL- I am not concerned about the clean/dirty ratio. I am trying to ask 2019 owners if they have an issue with stinky/disgusting Ford exhaust flowing into their cabins when they have the recirculate button pushed. Thank you.

AMPRG Enthusiast

AMPRG

Posted
Posted (edited)
1 hour ago, SS502 said:

OK...I'm not about to argue about the ratio (GM has posted 60/40) of fresh/contaminated air...the bottom line is it lets too much in. There is a whole section over in the K2XX forums about this problem. I am asking if GM fixed the issue for the 2019 because I will probably trade my 2018 in for a vehicle that has a recirculate function that really works. 

Well, I had the same issues as yours when I had my 2014. My new 2019 is much better, but don't expect completely air sealed. 

When I end up behind Marijuana smokers, I turn off the AC and manually push the recirculation button (its light comes ON). In this way, my 2019 seals the vent fairly okay, and much better than my old 2014. 

By the way, if I were you I wouldn't get rid of my new truck just because of this issue. Unless you are looking some justifications to get the new one. Then I can give you a list ?

Edited by AMPRG
  • Thanks 1
SS502 Senior Enthusiast

SS502

Posted
  • Author
Posted
1 minute ago, AMPRG said:

Well, I had the same issues as yours when I had my 2014. My new 2019 is much better, but don't expect completely air sealed. 

When I end up behind Marijuana smokers, I turn off the AC and manually push the recirculation bottom (its light comes ON). In this way, my 2019 seals the vent fairly okay, and much better than my old 2014. 

By the way, if I were you I wouldn't get rid of my new truck just because of this issue. Unless you are looking some justifications to get the new one. Then I can give you a list ?

First, THANK YOU! I am not wanting to trade in and I know it's never going to completely be free of outside air but not sure I can live with this stench. We have a lot of controlled burns around here and neither of my Honda's let in much, in fact we usually don't smell it until we are past the smoke, then some finds it's way in and that's acceptable. Just this morning I was behind a school bus and not close at all and within a city block it smelled like I was 2 feet off the bumper with my windows down LOL..again, thank you! If I trade I will wait until the second batch of the T1XX is out :thumbs:

  • Like 1
newdude Senior Enthusiast

newdude

Posted
Posted (edited)

HVAC blower box in T1 is different than in K2 by a good bit, but I can't find any specs on recirc from GM.

 

As far as K2...

 

3 hours ago, SS502 said:

OK...I'm not about to argue about the ratio (GM has posted 60/40) of fresh/contaminated air...the bottom line is it lets too much in. There is a whole section over in the K2XX forums about this problem. I am asking if GM fixed the issue for the 2019 because I will probably trade my 2018 in for a vehicle that has a recirculate function that really works. 

 

This is straight from GM:

 

Quote

GM Engineering has released updated HVAC calibrations which will close the recirculation door 90% when in recirculation mode. This will allow the HVAC system to draw in approximately 10% outside air, thus slightly pressurizing the cabin, making it more difficult for dust to enter the cabin. This is similar to how the previous generation truck's recirculation mode operated.

 

Edited by newdude
SS502 Senior Enthusiast

SS502

Posted
  • Author
Posted
8 minutes ago, newdude said:

HVAC blower box in T1 is different than in K2, but I can't find any specs on recirc from GM.

 

As far as K2...

 

 

This is straight from GM:

 

 

Okay, lets just agree on now 90% it doesn't matter to me if they say 99% the system doesn't work nearly as well as what I've always had, not even close. My 2008 Avalanche worked just fine and both my Honda's work just fine. Anyway, I asked a simple question and based on the replies, I should just live with 60-80-90% blocked off (although I highly doubt those claims) or whatever the real number is. I am not lashing out at you @newdude at least you mentioned a 2019 :thumbs: So I will just shut up and color, it must all be in my head LOL We must be having one of those group hallucinations...

 

 

Yotaman Enthusiast

Yotaman

Posted
Posted

I find it ironic that my 1988 Toyota PU had a sliding damper that went from recirc to fresh and when the recirc door closed no outside air came in......Ohhh the simple things I long for. I really don't understand my 14 Sierra system and do not even really try.

 

 

 

Yotaman

  • Thanks 1

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

    • Aimatdeer
      Ac not keeping up

      By Aimatdeer · Posted

      Monday looks like a good day for the dealer to test an ac issue. Hopefully it all turns out good.
    • CamGTP
      Gas Prices

      By CamGTP · Posted

      Paid $2.72 for E85 today.
    • Atlas
      Gas Prices

      By Atlas · Posted

      Welcome back! No, it definitely doesn't pass the sniff test. Even "ceasefire" needs an alternative definition these days.    $5.29 at Kroger today
    • bluev8
      Intermittent no-code issues on 2022.5+ V8 trucks — what did the shop fail to capture?

      By bluev8 · Posted

      That makes sense, and I think you are describing the real product problem. Capturing data is the easy part. If the owner or technician has to manually dig through five minutes of millisecond-level logs, the product has already failed. The device would be at the ECM harness, not at the OBD port, so I agree that data retrieval and event marking need to be thought through carefully. The way I am thinking about the architecture is: The recorder itself should not depend on a phone, app, Bluetooth, Wi-Fi, or cloud connection to capture the event. It should always keep a local rolling buffer and lock the event locally. A button, phone app, or small cabin device would only act as an event marker. If the driver feels a stumble and presses the button 10–30 seconds later, the pre-buffer has to already contain the useful data. For data retrieval, the practical options would be a sealed service USB lead, Wi-Fi download, or a phone/cabin companion device. I would not expect the owner to remove the ECM-side module or work with raw files directly. The cloud or AI side would be for interpretation, not for capturing the event. The truck may have no connection when the issue happens, so the evidence has to be saved locally first. After that, cloud processing could help decode the data, compare it against baselines, and generate a readable report. For the first version, I would keep the automatic triggers conservative and objective: driver event marker bus-off error passive voltage drop / brownout device reset FIFO or queue overflow a normally periodic message disappearing side-to-side communication mismatch, if the topology supports that For “learning normal,” I agree with your point, but I would not want to overclaim it as automatic root-cause diagnosis at first. A realistic first step would be learned baseline comparison for that specific vehicle and operating condition. For example, a value would only be compared against similar conditions: RPM range load / MAP throttle position gear / vehicle speed coolant and oil temperature battery voltage AFM/DFM state, if decoded and validated Then the report could flag things like: this periodic message disappeared compared with its normal timing this value deviated from this vehicle’s normal range under similar conditions the same abnormal pattern repeated after the same type of event the anomaly occurred together with voltage, oil-pressure, misfire, or communication changes But I would still call that “abnormal pattern detected,” not “replace this part,” unless there is enough validated repair data behind it. So the intended product would not be “here is a huge log.” It would need to be an event package: what triggered the capture how much pre/post data was preserved what changed before and after the event whether the device itself reset, overflowed, or saw a bus error selected graphs around the event raw data only as supporting evidence From your perspective, what would make this kind of report useful instead of just another datalog? For example: What are the top 5 parameters or events you would want highlighted first? Would you trust a learned baseline for that specific vehicle, or would you prefer fixed thresholds? How much false-positive flagging would be acceptable before you stopped looking at the reports? What would a one-page report need to show for an independent shop to take it seriously? For misfire, AFM/DFM, oil pressure, or U-code complaints, what would you want the tool to flag automatically?
    • scotthvac.net
      2022-24 halogen - led grille swap

      By scotthvac.net · Posted

      2024 Silverado 2500 HD LTZ grille no camera Parts list   84603331 84913656 84913657 84913654 84913655 84911567 84911568 85646092 85646093 85797921 85797922   11570637  x10-15   grille/bumper bolts 11546500  x10      grille clips 11571006  x10      push/retainer clips 11546454  x6       nut retainers 11611609  x6       M5 bolts 11610700  x6       molding/trim retainers

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...