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

SS502 · February 12, 2019

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 February 12, 2019 by SS502

avalonandl · February 12, 2019

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

mfennema · February 12, 2019

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.

SS502 · February 12, 2019

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 February 12, 2019 by SS502

avalonandl · February 12, 2019

There is a Recirc mode.

SS502 · February 12, 2019

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.

avalonandl · February 12, 2019

It should be 80/20.

SS502 · February 12, 2019

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 February 12, 2019 by SS502

pickmeup · February 12, 2019

my understanding is no matter where you set controls it is a split of inside /outside air . 80/20 does sound familiar but not sure.

SS502 · February 12, 2019

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 · February 12, 2019

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 February 12, 2019 by AMPRG

SS502 · February 12, 2019

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

newdude · February 12, 2019

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 February 12, 2019 by newdude

SS502 · February 12, 2019

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 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 · February 12, 2019

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