Oil cooler line & trans cooler line replacement

[domoarigato]

Hey guys!

Popped the hood today and noticed a few lines seeping. I just want to double check with you PPV vets before I go ahead and order parts.

Correct me if I'm wrong... but the lines going into the radiator on the drivers side is for the oil cooler, and the lines going into the radiator going into the passenger side is for the trans cooler.

With that being said. Since this is a PPV I believe I need lines for the HD trans cooler right? I have pulled up the following part numbers:

Trans Cooler Line: ACDELCO 25999420
Oil Cooler: ACDELCO 20828695

Is there anything else I'm overlooking?


Thank you!

 

[GranPrix]

Yes, oil on the driver side and ATF on the pass side.

 

[992dr]

You are correct.
I replaced my oil lines a few weeks ago. My lines were seeping pretty bad.

 

[domoarigato]

You are correct.
I replaced my oil lines a few weeks ago. My lines were seeping pretty bad.

The part numbers I listed look good? Either way, I already ordered them and will know shortly

I'm assuming all the oil has to be drained first correct?

 

[CrashTestDummy]

The part numbers I listed look good? Either way, I already ordered them and will know shortly

I'm assuming all the oil has to be drained first correct?

I haven't done this, but suspect there's an anti-drainback check valve in the oil cooler circuit, so draining the oil, or removing the oil filter will get you nothing but two messes. I could be wrong, but I bet all you can do is pull the line from either end to start it draining. I think I'd start at the engine end, unless the FSM says differently.

UPDATE: FSM goes front to back. I'd have to get under the truck to see which direction I'd think would result in less of a mess, though. I suspect it's just something you'll have to expect to get oily doing.

 

[992dr]

The part numbers I listed look good? Either way, I already ordered them and will know shortly

I'm assuming all the oil has to be drained first correct?

You're good to go
This is what I used = ACDelco GM Original Equipment 20828695 Engine Oil Cooler Hose Assembly
I did not drain my oil.
I had just changed my oil before changing the lines. Why, don't ask I just unhooked them and pulled them off. Just be prepared for some oil to drain, not really that bad. I did unhook the top to help them drain.

 

[CobraKing]

@domoarigato @992dr How hard was it for you guys to change these lines? Noticed some droplets on the driveway this morning towards the front of the vehicle and I think I may have to replace these lines as I had noted some seepage when I first picked up the truck.

 

[RichardCranium]

It's that time of the month for a few of us evidently, my trans cooler lines are seeping enough to leave about a 2" wet spot overnight.

 

[992dr]

@domoarigato @992dr How hard was it for you guys to change these lines? Noticed some droplets on the driveway this morning towards the front of the vehicle and I think I may have to replace these lines as I had noted some seepage when I first picked up the truck.

It wasn't bad at all. Being 2wd there's plenty of room and the lines are flexible enough to maneuver down and around the motor and over the cross member.

 

[992dr]

It's that time of the month for a few of us evidently, my trans cooler lines are seeping enough to leave about a 2" wet spot overnight.

When they go, they all go together hah.
My trans lines haven't started yet. My coolant line/adapter coming from the water pump is leaking though. Some weird looking fitting and its all plastic.

 

[domoarigato]

@domoarigato @992dr How hard was it for you guys to change these lines? Noticed some droplets on the driveway this morning towards the front of the vehicle and I think I may have to replace these lines as I had noted some seepage when I first picked up the truck.

It wasnt bad at all like @992dr stated. I did it while I did my oil change to minimize the amount of oil that leaked out.

My replacement lines from AC Delco did not come with the quick disconnect retainer c-clips so be careful when you remove yours because you will have to re-use them.

The only bad part (which wasnt that bad), was fishing the oil line out / in. It helps if you have another set of hands but I managed with myself.

It also helps to unbolt a few of the undertrays to give you some more room to work with.

It's that time of the month for a few of us evidently, my trans cooler lines are seeping enough to leave about a 2" wet spot overnight.

I still need to do my trans lines. They seem to be a little more harder to access than the oil lines. Let us know how it goes.

 

[CobraKing]

@992dr @domoarigato @RichardCranium Thanks for the insight and replies. Did a bit of research on some other forums and some guys have said that adding some additional clamps might help. From your observations do you think it would?

 

[992dr]

Yes, I removed both trays helps a bunch, it really opens things up.

Fishing the lines through was a little tricky but like Jake said, its not that bad. I also did this by myself, it wasn't too bad. Just be patient and it'll all fall into place.

Hmm, not quite sure what you mean by additional clamps? What would you need additional clamps for?
To hold the lines after they were installed?

 

[CobraKing]

Yes, I removed both trays helps a bunch, it really opens things up.

Fishing the lines through was a little tricky but like Jake said, its not that bad. I also did this by myself, it wasn't too bad. Just be patient and it'll all fall into place.

Hmm, not quite sure what you mean by additional clamps? What would you need additional clamps for?
To hold the lines after they were installed?

Adding the clamp would stop the seeping. That's what some people were suggesting.

I'm going to put the truck on my ramps tomorrow and take a look and see if the above fix is viable. Shouldn't cost too much in the grand scheme of things too.

 

[992dr]

Adding the clamp would stop the seeping. That's what some people were suggesting.

I'm going to put the truck on my ramps tomorrow and take a look and see if the above fix is viable. Shouldn't cost too much in the grand scheme of things too.

Do you have any picture of the clamp and where it is affixed to?
I have not heard of this method to eliminate the seeping.
Thanks

 

[CobraKing]

@992dr I saw this particular post. Didn't get a chance to look under the truck today. Will do so tomorrow. The dripping has stopped though.

http://www.gm-trucks.com/forums/top...lines-leaking/?do=findComment&comment=1837778

 

[Samuraj]

interesting........
i have to try this !

 

[992dr]

@992dr I saw this particular post. Didn't get a chance to look under the truck today. Will do so tomorrow. The dripping has stopped though.

http://www.gm-trucks.com/forums/top...lines-leaking/?do=findComment&comment=1837778

I'll have to take look under y Tahoe this weekend.
I'm trying to picture what he's saying but am having a hard time trying to picture it. Maybe when I take a look I'll be able to get a better idea.

 

[Jsal13]

Hey guys!

Popped the hood today and noticed a few lines seeping. I just want to double check with you PPV vets before I go ahead and order parts.

Correct me if I'm wrong... but the lines going into the radiator on the drivers side is for the oil cooler, and the lines going into the radiator going into the passenger side is for the trans cooler.

View attachment 317581View attachment 317582
View attachment 317583 View attachment 317584

With that being said. Since this is a PPV I believe I need lines for the HD trans cooler right? I have pulled up the following part numbers:

Trans Cooler Line: ACDELCO 25999420
Oil Cooler: ACDELCO 20828695

Is there anything else I'm overlooking?


Thank you!

For the trans cooler line is it 1 or 2 lines ?

 

[mikez71]

There is another separate line from radiator to cooler.
Technically 3 lines, but two part numbers.