• If you currently own, previously owned or want to own an Avalanche, we welcome you to become a member today. Membership is FREE, register now!

2500 Ava Lower Oil Cooler Line

mdovenmuehler

Full Member
Joined
Sep 18, 2018
Messages
54
Location
Twin Falls, Idaho
The one with the square shaped connection that goes above the differential....I found one thread that said you should be able to reach up there and get it removed...is it me or is that correct, you just reach up there and with a little effort get the clip out and pulls out x_x. If I have to drop the diff someone else gonna be doing it. Ive also read you can get a clamp and just put a clamp over the current ones and clamp down to see if it helps. The leak is minimal, maybe a quart of oil every six months.
 
I don't know about putting a clamp on it to stop the leak...

But it's not that hard to slide down the plastic clip retainer and then pull the clip (use a small pic or screwdriver) and then just pull out the tube end from the fitting.. The hardest part when I changed mine was the clamp that is bolted to the block that holds the tube, not removing it but getting the bolt started and holding it with one hand.. If it was on a lift or I had someone reaching up from the rear to hold it while I started the bolt would have made it easier.. A little tougher on your back in the driveway..

Then put a little oil on the oring when you seat the tube back into the fitting, if you cut it, It will leak.. And make sure you seat it all the way and that the tube lip is past the clip, try to pull it out after you push it into the fitting to make sure in far enough and then put the plastic retainer back over the fitting.. It does have a purpose..

Not that hard to do.. Maybe a 1 on a 1-5 scale..

Good luck
 
Does anyone know of a better made hose than the GM ones? I replaced the original hoses with replacement GM hoses and now those are leaking.
I'm not putting more GM hoses on my truck.
 
Thanks for the info. Im going to get under there this weekend again, changing rear shocks so will have a double take on it. There is no plastic clip or cap on the end where it goes above the differential. Taking it off the oil cooler is easy enough its just underneath Im not sure of.
That is the cooler hose in question, it has a square end on the side in question. I didnt look too hard at first as I saw it above the diff and thought wtf is this repair install im looking at.....lol
Hopefully that helps on the part im talking about, no plastic clip there, Im guessing it pushes in and uses the retainer clip.
1616604297601.png
 
Yes that's a factory line with the square end.. I suspect it's that way to keep it tight to the block so the other line can be routed right over it close.. The plastic retainer should come on the new lines..


For those who don't want to use a GM part Dorman has them.. I replaced mine once way back and have not any leaks since.. Knock on wood..


 
sadly looking at dorman its the same end I currently have lol

x_x I have a 2005 avalanche, which is funny its a 3/4 too but it doesnt use the same oil cooler lines your 2002 has lol. Sometimes I wonder if GM did these things just to annoy us or make me hate them even more when it comes to fixing or doing anything on my truck lol. Ive tried to look everywhere and all I can find is the same square end. Is it put in the same way? Im assuming the lock pin is literally jammed in the groove close to the connection? I will try to get a picture of it tonight maybe and see if I can reach up there and see the connection better, hell if its as simple as pulling the retained clip and pulling down to get it out perhaps my tiny arms and hands can reach up there and do it :)
And thanks for the input
 
More than likely they changed the routing around accessories, location of the fittings on the radiator or even the fittings themselves but they work the same, maybe they found the flaw and made them better. But pretty sure by looking at the pictures they still have an clip that holds them, an oring that seals it and R&R is the same.. As always on any recommendations on here you need to look up parts for your model and year..

And yes it's as easy as removing the clips and pulling lines out, access is the issue, it's tight.. Look at clips on the radiator first to get an idea of how to remove them, but don't disconnect them. Do the ones on the motor first and then put a drain pan under them and then disconnect the top radiator line so the oil drains from the cooler and you will make less of a mess, two people makes it easier.. If there's anything different let us know..
 
Back
Top