OE trans cooler?

[buck91]

So it seems our "new" Tahoe does not have an auxiliary transmission cooler. What pieces are needed to at the OE unit? I did found this eBay auction, is that all that's needed? Looks like it completely bypasses the in-rad unit, then?

ebay link

 

[donjetman]

I'm replacing my OE trans cooler lines because one is leaking. GM #s 25999419(2 lines in 1) $70 and 15779543 $14. The front end has to come off to get to the clips that retain the lines to the cooler.
View media item 27407View media item 27406

 

[swathdiver]

So it seems our "new" Tahoe does not have an auxiliary transmission cooler. What pieces are needed to at the OE unit? I did found this eBay auction, is that all that's needed? Looks like it completely bypasses the in-rad unit, then?

ebay link

That looks right but I'm coming up with different part numbers when I plug my VIN in over at GM Parts Direct. I've bought a lot of parts from Quirk, give them a call and tell them what you're trying to do to be sure.

Cooler - 20880895
Inlet Pipe - 25999418
Outlet Pipe - 15779543
Retainer - 15049288

Probably just superceded part numbers. Sometimes you can check them over at oecats.com

 

[donjetman]

My RPO cooler code is KNP
I have the inlet line in hand, # 25999419-$56 Amazon, and its looks identical to what came off?
View media item 27409The outlet line, # 15779543 - $15 Amazon, will be here tomorrow, the picture looks identical to what I'm replacing. The retainer clip # I show is 24205103 - $5 Amazon.
View media item 27410View media item 27408

 

[donjetman]

I think I figured it out? # 25999418 is for a vehicle that does NOT have an external trans cooler. Those 2 lines run between the trans and radiator only.

# 25999419(like I have) is for vehicles that came with a OE external trans cooler. One line runs to the bottom fitting of the radiator and the other line runs to the outlet side(driver side) of the external trans cooler. The third line, #15779543, runs between the top radiator fitting and the inlet side(pass side) of the external trans cooler.

 

[Ilikemtb999]

I think I figured it out? # 25999418 is for a vehicle that does NOT have an external trans cooler. Those 2 lines run between the trans and radiator only.

# 25999419(like I have) is for vehicles that came with a OE external trans cooler. One line runs to the bottom fitting of the radiator and the other line runs to the outlet side(driver side) of the external trans cooler. The third line, #15779543, runs between the top radiator fitting and the inlet side(pass side) of the external trans cooler.

The part number I see for the external cooler lines (rpo #KNP) is 25999420

 

[Tonyrodz]

That looks right but I'm coming up with different part numbers when I plug my VIN in over at GM Parts Direct. I've bought a lot of parts from Quirk, give them a call and tell them what you're trying to do to be sure.

Cooler - 20880895
Inlet Pipe - 25999418
Outlet Pipe - 15779543
Retainer - 15049288

Probably just superceded part numbers. Sometimes you can check them over at oecats.com

 

[swathdiver]

View attachment 211520

What happened to your phone?

 

[Tonyrodz]

What happened to your phone?

Tried oecats.com and the link wasn't good.

 

[donjetman]

The part number I see for the external cooler lines (rpo #KNP) is 25999420

I think your right, but after studying ea there isn't much difference between 25999419 and 25999420, I'll let you know how it works out for me.