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2016 Sierra 5.3/6 speed 4WD oil cooler line replacement

2016 Sierra 5.3/6 speed 4WD oil cooler line replacement

Postby vukiclab [OP] » Jan 15 2020, 8:33pm

I'm trying to replace oil cooler lines (not transmission fluid) and I am having trouble pulling the old lines out either way - to the back the front drive axle seems in the way of rotating the aluminum block on the piping to get it out, and to the front the same aluminum block can't go past the driver's shock mount.

Any piece of advise is highly appreciated!
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Re: 2016 Sierra 5.3/6 speed 4WD oil cooler line replacement

Postby Spectreniner » Jan 15 2020, 8:49pm

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Re: 2016 Sierra 5.3/6 speed 4WD oil cooler line replacement

Postby FoxProDenali » Jan 15 2020, 8:57pm

I got mine out without removing the front drive axle so it's definitely possible. What's really in the way is the plug on the engine block (not sure what it's for). You do have to remove them from the radiator first and get them twisted in a way so you can turn that block on the piping the right way. Once that's lose they slide right out. Go slow and take your time.
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Re: 2016 Sierra 5.3/6 speed 4WD oil cooler line replacement

Postby vukiclab [OP] » Jan 15 2020, 9:43pm

I've been fiddling with it for about two hours and it's two of us here... I just took the new lines to the hydraulic shop across the street to have fittings installed so there's a removable hose section, and I cut the old piping to remove it. Yes, it's a bigger expense but at least now I know I won't have a compression fitting failure again.

By the way, this happened at 40k miles.
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Re: 2016 Sierra 5.3/6 speed 4WD oil cooler line replacement

Postby CritterGitter » Jan 15 2020, 9:50pm

Yup, mine started leaking at around 60k. From the compression fittings, they suck and are almost always the culprit.
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Re: 2016 Sierra 5.3/6 speed 4WD oil cooler line replacement

Postby vukiclab [OP] » Jan 15 2020, 9:51pm

Yes, mine started leaking at compression fittings and I am getting ready for a move from NC to OR in about 10 days...
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Re: 2016 Sierra 5.3/6 speed 4WD oil cooler line replacement

Postby vukiclab [OP] » Jan 16 2020, 7:04pm

I finished installing the modified cooler lines, and did a transmission fluid change at the same time before firing up the motor again. The oil pressure was surging for a bit I suppose until all air pockets have cleared. My motor oil pressure is back to normal, and the transmission seems to be shifting slightly better with the new fluid. However, my check engine light is on (I assume due to intermittent high oil pressure); I was wondering if this condition is normal and will the light reset or do I have to get a scanner to do it?

Thank you for all your responses!
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Re: 2016 Sierra 5.3/6 speed 4WD oil cooler line replacement

Postby vukiclab [OP] » Jan 16 2020, 8:37pm

Check engine light turned off after a little bit - all is normal now.

Here is how the modified oil line turned out:

P1020417.JPG

P1020424.JPG
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