AC Condensation runs over Transmission/Exhaust

redwngr · May 10, 2023

The condensation thing has been talked about (complained about?) for a bunch of years.

The crossover pipe is manufactured using a hydroform process so it has the same cross-section as when it was round.

Exhaust Pipe Shaped to Avoid Low Contact

July 30, 2020

A quick look at the exhaust pipe crossover section on 2019-2020 Silverado and Sierra models equipped with a V6 or V8 engine shows that it is not a completely round shape as other parts of the pipe. (Fig. 27) The unique shape of the exhaust pipe is by design. The kinks or shape of the pipe does not indicate the pipe is damaged.

Fig. 27

The exhaust pipe is distinctly formed in order to make it higher from the ground than the adjacent frame members. (Fig. 28) Due to its unique shape, it is not the lowest part on the vehicle and is protected by the frame from contact while traversing over areas with low ground clearance, which helps prevent it from being struck by objects passing under the vehicle. While driving off road, for example, an object would strike the frame first.

Fig. 28

The design of the crossover section of the exhaust pipe is hydroformed, or shaped by hydraulic pressure, to an ovate shape that has the same cross-section as a round part of the pipe.

There is no flow restriction from the shape and it does not affect engine performance in any way. (Fig. 29)

Fig. 29

John33 · May 12, 2023

I had a Silverado little while back and was having issues left and right. Contacted California Lemon law Center to see if something could be done about it; they were able to get all my payments back and even some on top. Would highly recommend any of you who are experiencing issues with your cars to reach out and see if you have a case.

Here’s their website: https://californialemonlawcenter.com/

BrianBuc · August 24, 2023

On 5/31/2019 at 2:31 PM, wu8always said:

2019 AT4 Crew Cab (6.2Lt)

The AC condensation somehow makes it down over the transmission and then drips on the crossover pipe of the exhaust below the transmission pan. I keep hearing the singe sound of the water on the hot exhaust when i pull in the garage. Anyone else have this issue? I'm assuming there is a drain tube or hose that might be missing or misdirected. Any comments/suggestions?

Thanks.

This is what my RST 2020 6.2 is doing, don't like cold water hitting my exhaust

ero2 · August 28, 2023

My 2020 5.3 Elevation does the same, glad I'm not alone.

INGMWETRUST · August 29, 2023

Took it in last week for service and had them look into it.

Tech stated it was completely normal and no TSB has been released about it.

Jus Cruisin · August 29, 2023

I haven't looked but the drain hose for the a/c should be able to be rerouted/relocated

GomezSr · April 4

On 5/31/2019 at 1:31 PM, wu8always said:

2019 AT4 Crew Cab (6.2Lt)

The AC condensation somehow makes it down over the transmission and then drips on the crossover pipe of the exhaust below the transmission pan. I keep hearing the singe sound of the water on the hot exhaust when i pull in the garage. Anyone else have this issue? I'm assuming there is a drain tube or hose that might be missing or misdirected. Any comments/suggestions?

Thanks.

GomezSr · April 4

Mine is doing the same thing. The evaporation is so bad that it has damaged my cabin filter twice now. When standing in traffic I can smell the evaporation inside the cab. I am extremely pissed off because it has taken 2 years for GM to even acknowledge that there is a major problem here. There is no fix for it. When I bought my truck I was told, if your vehicle had to be in the shop for more than 3 days I would get a loaner. Apparently they don't have enough loaners to keep up with all the new crap they have put out. My 2018 silverado 1500 was worse. Ticking lifters and a transmission that kicked like a mule. I should have sued GM then but I gave then a second chance. That was a huge mistake. Now I have to spend money I don't have on a rental to get the diagnostic submitted to GM even though there is no fix. Check your cabin filter and you will see were all that condensation is going. My truck is less than 2 years old and I'm on my 3rd filter. These filters are not cheap. If anyone knows a good lawyer send them my way.

On 5/31/2019 at 1:31 PM, wu8always said:

2019 AT4 Crew Cab (6.2Lt)

The AC condensation somehow makes it down over the transmission and then drips on the crossover pipe of the exhaust below the transmission pan. I keep hearing the singe sound of the water on the hot exhaust when i pull in the garage. Anyone else have this issue? I'm assuming there is a drain tube or hose that might be missing or misdirected. Any comments/suggestions?

Thanks.

Crystalgail · August 6

No they haven’t changed it. I have a new 2023 Tahoe and mine does it also. Drives me nuts

GMCustomerService · August 7

On 8/6/2024 at 2:06 PM, Crystalgail said:

No they haven’t changed it. I have a new 2023 Tahoe and mine does it also. Drives me nuts

We regret to hear of this concern you are facing with your Tahoe and would like to take this opportunity to learn more and assist. At your convenience, please send us an email to [email protected]. Be sure to include your Username and Forum name in the subject line. We look forward to your email.