Leaking transmission cooler lines

[Jobi-Wan Kenobi]

Noticed here a couple weeks ago that I'm going to need to change transmission cooler lines soon. I have the KNP RPO code and looks like there's 3 lines for it. Should I just figure changing all 3?

 

[rockola1971]

Noticed here a couple weeks ago that I'm going to need to change transmission cooler lines soon. I have the KNP RPO code and looks like there's 3 lines for it. Should I just figure changing all 3?

Where are they leaking at?

 

[Jobi-Wan Kenobi]

@rockola1971 what i had found so far is where they connect to the oil cooler.

 

[rockola1971]

@rockola1971 what i had found so far is where they connect to the oil cooler.

Leaking Oring or does your lines transition from rubber to metal and have the crimp fitting?

 

[Jobi-Wan Kenobi]

They had steel crimped on to rubber. I can get a picture later if it helps.

 

[Jobi-Wan Kenobi]

This is what I've observed leaking so far. Linda hard to tell where it's really coming from right now.

 

[rockola1971]

If there's one thing GM OEM parts werent good at, its their crimped lines. They always end up leaking. Id plan on replacing all 3 lines. Any shop that does hydraulic lines can build you a new set but they likely will need your set in front of them. Its been many years but ive had to go this route before. Might get an estimate first and price new line set from auto supplier and see which works for you. The custom set locally will likely be better built than the OEM parts supplier.

 

[Jobi-Wan Kenobi]

Thanks @rockola1971 . I may end up just doing OEM lines. Looks like there are some places around that I can have lines made. The issue is this is my only vehicle so I'd need something I can swap in over a weekend. Rockauto has the GM lines for under $70.