2023 Silverado 5.3 4x4 Random Hose Hanging Loose After Oil Cooler Line Replacement

[forest]

So I took my truck to another dealership besides the one I bought it at to have them take a look at the leaking engine oil.

 

Took 15 minutes for them to confirm leaking engine oil cooler hoses and they replaced them.

 

They couldn't figure out why the other dealer needed to add dye to the engine oil and make me drive it around for 300 miles to make it leak more.  They said it was totally obvious.

 

So I just spent 2 hours cleaning up the undercarriage of the truck from the oil that was all over from the leaking and the repair and I came across this random hose.

 

It is down by the front diff and terminates up near the battery where it is electrical taped onto a wiring harness.

 

Does anyone know what it is?  I don't recall seeing it before.  

 

If it was something important I can't believe that the service technician wouldn't have hooked it back up.  Maybe I should just rip it off?

 

Took off the right front wheel well liner to keep an eye on the engine oil cooler lines to see if they start leaking ... even though they were originally leaking at the engine block adapter.

 

They also said something about a TSB for the adapter bolts being too long to get proper torque which made connection leak at gasket.  I couldnt find that TSB and they didnt mention it in the notes.

 

Check out pics.

 

I also created a complaint with the NHTSA on the leaking oil cooler lines just in case anyone else is experiencing them. 

 

I had less than 1000 miles on the vehicle before I noticed the leak.

 

 

 

 

Edited November 17, 2023 by forest
added NHTSA notes

[Sneaky pete]

That looks like your front diff. vent. It should be up higher next to your coolant reservoir. I would move it up and zip tie it. Or you could leave it. Typical lazy tech

Edited November 17, 2023 by Sneaky pete
Add to response.

[forest]

Thanks for the info. 

 

It was the front diff vent hose that was disconnected. 

 

Not sure if that was intentional or accidental. 

 

Glad I saw it.  I put it back on.  

 

Is there supposed to be a hose clamp to stop it from coming off?

[Sneaky pete]

Put a clamp on it.