Truck is a 2014 Sierra 1500. AC quit two weeks ago. Got it in to the dealer today and diagnosis was "freon very low". They topped it off ( free!) and checked for leaks. None found. They asked me to bring it back in two weeks or so and they will check freon charge. I read somewhere that these trucks have an issue with the aluminum/rubber lines leaking do to vibration and that GM came out with a bracket to support the lines. Anyone have any info on this? Is there a TSB that lists the part number for the bracket? Somewhat sounds like the issue that GM had with oil cooler lines leaking. Truck is my sons and he is in the Air Force, heading to Oklahoma for training and I would like to get this resolved before he goes.
I bet that is the problem. Probably too much load at the weak point of the line causing it to flex and crack. could be right at the fitting
My Cadillac had a similar problem
Would totally pass a leak test but under pressure it would leak out from where the hose mates with the aluminum line.
Do not put or let anyone put stop leak in your system.
Should be warranty.
they had that issue with trans lines, oil lines, etc...
Old School GM fan FOREVER
Edited by rockfangd on 04-18-17 06:13 PM. Reason for edit: No reason given.
I checked the temperature ( at the outlets ) and it was around 40 degrees. I knew their answer before bringing the truck in, "No problem, working fine." So we will drive it for a few more weeks and bring it in for a recheck. Hopefully we will get some warm weather to stress the system, it is 49 degrees here today.