dzsmith

I figured it out . This piece in the picture is part of the vent can for the tank. A hose runs from the can , back to the fill neck . The shroud or whatever you want to call the piece that you are looking at when you open your fuel door, is where this attaches . It’s on the top side and the 2 tabs I mentioned are what holds it there . Tons of info on replacing the can out there but very little is mentioned about this . If you were to replace the can and solenoid as an assembly this would come with it from what I can gather . Just thought I would update this post to key Yal know I did figure it out .

Sounds like you got scammed dude . Take it back, and show them that it doesn’t have a 70 stamped on it. I literally replaced mine in the last calendar year and it has a 70 stamped on it….. now , as far as the temperature , if I drive all day long or at least over an hour in hot weather or under heavy load I have still seen fairly high temps , but I would say average at once heated up is 160s and 70s verses originally in the 180s and 90s all the time but never quite hot enough for it to open . With it opening at 158 on the new i at least know it’s going through the rad where as before on a 10 hour road trip at 192 pegged it was just sitting there cooking.

Today I had to climb under my truck and I noticed something with a hose attached hanging behind the cab, driver bed side by the fuel filler neck . matter of fact the hose is attached to the full hose with a clamp/clip. Anyway it’s sort of a box , and it had 2 pieces of foam inside . Some sort of vent/filter canister type thing. I cleaned the foam since it was hanging there . It has 2 tabs , so you can tell that is what is used to attach it where ever it’s supposed to go. However I cannot figure out where it’s supposed to go,or how it ever came unattached . I took some pictures . Perhaps a vent for the axle….. it’s not the fuel tank canister as that is in front of the tank and is round . 2014 gmc Sierra 1500 z71 double cab

Yep that’s how I feel. Better than 190. I’ve been commuting in my truck this week. Oddly enough other than the initial 2 drives . It’s never hit 170 again, but we had a little cool front come in so I’m sure that helps. Thanks for the replies. I’m not to worried about it .

Had my transmission rebuilt in December 2021. Had to replace my leaking cooler lines recently , and decided to update to the newer thermostatic bypass valve while I was there. The one stamped with 70F and opening at 158f verses 194f on the old one. I’m curious as to what temps you guys are seeing on the new one. On my old one, it would take 30minutes to an hour driving at 70mph to get up to around 194F and it would stay there , as if it may just sorta open and close a little but never really got higher . My new one will get to 158F at around 20 minutes at 70mph, but it does continue to climb. I drove it an hour today . And the highest it got was 171F. I also noticed on the first drive , when I came home, and the vehicle was idling without the fans running , that it climbed to 171 while sitting in the porch. It was relatively cool outside , no a/c running on the vehicle so I’m not surprised my fans were not kicking on and off much , I’m sure I could have idled it long enough too. Anyway , I’m just curious as to what temps Yal are seeing on the new thermostat . It’s obviously opening sooner and keeping the temp out of the 190s but 170s still seems a little high for my liking . It doesn’t stay there , but it does stay in the 160s. Is additional cooling needed ?

I have considered what Yal mentioned with cutting the crimps and using hose clamps with a new hose . I found my problem though. Dorman’s part number that I mentioned is not for 2014 sierras with a thermostat block. Dormans part number 624-437 is not supposed to be for a 2014 Sierra according to any part store I looked at…. But guess what …. That’s exactly what I had . And it could only be found by searching for a 2018 … not 14,15,16, or 17. Very weird . Anyway I returned the part for a one for one swap. And it appears to be correct . I was totally prepared to cut it and clamp if I had to. But this is more than just an around the house vehicle . Take a look at the attachment for part number 624-437 Hose.pdf

I’m sure there’s many posts regarding leaking tranny cooler lines . I simply want to replace mine. However I cannot find the exact lines I have anywhere . Every parts store has 624-205 as a dorman replacement set. It would appear this is made for a model of transmission without the thermostat block. My model has the thermostat block, and has the push in lines with the clips on the fittings verses some where the line assembly bolts on to the block the same way the block bolts to the transmission. I see most part stores also have an alternative and unavailable ac Delco part…with the thermostat block attached . This is not the push in style block like I have however , it would at least work on my truck being the block mounts up the same way . Every part store has told me , they will have to follow up with me to see it it can be ordered , as they are listed unavailable in most places . As to why this dorman replacement is everywhere you look I don’t know. I don’t know of any 2014-18 6l80s that do not have the block and every store says it will fit. The assembly isn’t even oriented the same way as the oem , mind you it is pretty close in some ways. I’m stumped ….. I just want to replace this part…. I don’t see it in any store or anywhere on the net ……

The failure rate is high....man. my bosses truck didnt have a lifter stick until 160k.....Another guy i work had one stick at 120k, my uncle had one stick at 90k and another guy i work with had one also stick at less than 100k.....its pretty common. by the way my uncles was the 6.2...i will admit you dont hear about it as much on other afm engines besides the 5.3 but thats mostly because 99% of gm truck owners i know have the 5.3....and i dont know a single 1500 gm driver with a 4.3 not one.

dude...this is absolutely common. I would say greater than 5 out of 10 5.3 v8 truck owners i know with trucks from 07-2021 have had lifter stick because of AFM. some under 100k and some over. doesnt matter. its a ticking time bomb. Most people now days do not keep vehicles past them being payed for so 5 years or so. i have a 14 and i have had every single common failure on that body style so far except the lifter one. TCC shuddder, bad welds in the condenser, over pressurizing the radiator from a faulty thermostat housing, fuel pump, fuel module, .....all 02 sensors have failed and been replaced at some point and 2 cats. all of this within 130k and i maintenance my vehicle on the dot. yeah these trucks suck.....the QC isnt there. I do agree the 5.3 is a good motor outside of AFM...but AFM will fail. its when not if.

i have a 14 sierra with the 6 speed. Mine just started doing the shudder thing to. Actually it didnt start out that way. It started out as what i would describe as a very faint and occasional "misfire" type of feeling except i could feel it in the floor board under my feet while driving. not very consistent and unpredictable when it would do it. The tic continued and eventually developed into more than a single little tic and a shudder like driving over a rumble strip or cattle cap. it doesnt dot it at low speeds though, generally 45 or higher. some trips it dont do it all. A friend of mine experienced the same thing in his 2016 all terrain sierra with an 8 speed. of course with the 8 speed there is the service bulletin to do the flush blah blah blah....i took mine to the dealer, and they did not suggest that on the 6 speed. they pretty much told me "youre screwed" drive it til it breaks then have the tranny rebuilt. Another private mechanic shop told me the same thing. He said flushes are no good on the 6 speed, and additives like shudder stop are also no good. it will eventually fail. he did however tell me .....its not gonna burn up tomorrow . you could very well drive another year before it happens so enjoy it while it last and save your money. he also said dont bother with a rebuild. but a better aftermarket transmission with a better torque converter, and a few billet parts here and there that need to be, and it shouldnt happen again. So....im hoping my tranny will last the rest of deer season. I make some long trips in the spring during turkey season so i suspect have mine overhauled in february