Join Date: Apr 2011
Location: Barrie, ON, Canada
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Re: replacing trans cooler lines
Replaced the lines on my 2007 last year. They did not look as rusty as yours but were covered in oil and assumed to be leaking. Once I removed the part I was able to find a very small crack were one of the tubes was welded to its bracket.
Ordered part from Rockauto and it was a perfect match. I used some similar sized steel bars to create plugs for the rubber hoses. Disconnected the lines starting at the highest point first. This way the fluid would gravity drain back to the transmission. When disconnecting the lines at the bottom of the radiator and closest to the transmission be prepared,once you remove the hose form the line, to hold the open end as high as possible to avoid draining oil then insert plug. The hose/plug only needs a friction fit as nothing is pressurized. I did spill some oil but very little. Once all the lines are disconnected replace the part. Reverse process in attaching new lines. You can add a 100 or 200ml back into the new lines before you close the last tube. That small quantity will not make a difference as there should be about 5 litres in total in the tranny. Don't worry about air entering the system as it is vented anyway.
Only do the above when the engine and oil temperate are at ambient. You really don't want hot transmission oil running down your forearms
You can warm up your transmission and check the oil later.