Transmission coolant lines in 2006 Expy

[Michael Septer]

I have a 2006 Expedition Limited with a leaking transmission coolant line--part no. 6LIZ-7R081-AA. Apparently Ford no longer manufactures that part, and no aftermarket parts are available. So it seems that my 2006 Expy is already obsolete in the eyes of Ford. The other transmission coolant line, part no. 6LIZ-7C410-AA, is also discontinued. In the meantime, I've patched the main line with some rubber hose and clamps, but it's pretty badly corroded all the way to the radiator connection. Any suggestions? It only has 86K miles on it, so I would hate to throw this away.

 

[Hamfisted]

A transmission shop should be able to make up some cooling lines for you.






.

 

[Michael Septer]

I figured that might be a final option, but there's a special connector at the radiator, so I wasn't sure if they could replicate that.

 

[cecilbridge]

You can find the transmission oil cooler and radiator line on eBay .. DORMAN part # 624-511

Dorman 624-511 Transmission Oil Cooler and Return Line fits Ford Expedition | eBay

Dorman 624-511 Transmission Oil Cooler Line fits 2005 Ford Expedition. Model : Expedition. During those years, they specialized in custom paint and body. Koskowski Automotive, LLC is an authorized distributor for Dorman Products.

ebay.us

You’ll also need the Lisle scissors tool #39660 (order from O’Rilleys)
It’s easy to do and fits perfectly

 

[dr2024]

Well that’s aggravating - no new parts available.

I replaced mine (‘06) several years ago due to catastrophic corrosion under one of the polymer line clips.

Thoughts -

Maybe a good transmission shop can re-use any of the connectors that are not standard.

There are actually three lines - one from the transmission to the left side of the engine coolant radiator, a short line from the engine radiator to a small, dedicated cooling radiator, and then a return line from the dedicated radiator to the transmission.

The outbound and return lines are segmented - within 18” or so from the transmission they feed into a thermostat valve block, which bypasses the cooling loop until the transmission fluid is warm enough. Maybe re-use that valve block.

86k, possibly a lot of life left!

 

[dr2024]

Echoing Cecil, it’s not a bad job.

I replaced all three lines, the main lines connecting the transmission came connected together by the valve block, I undid them from the block to place them then re-fastened the valve block.

The connection at the engine coolant radiator between the radiator and the line coming from the transmission was sticky and required extra force to release with the Lisle tool, fingers alone weren’t enough so I fashioned this, using the ring of the box end wrench to press the Lisle tool in to release the connection -

It may look like overkill, but I needed it.

 

[dr2024]

I used Lisle 39220 (from O’Reilly).

Same sizes as Lisle 39660, 3/8” and 1/2” set for Ford transmission oil cooler disconnect, but different form factor.

 

[dr2024]

*The Lisle tools are clamshell. I cut the old line so there was only a stub of line connected to the coupler into the engine radiator, the ring of the box wrench fit over the stub.

 

[Michael Septer]

Well that’s aggravating - no new parts available.

I replaced mine (‘06) several years ago due to catastrophic corrosion under one of the polymer line clips.

Thoughts -

Maybe a good transmission shop can re-use any of the connectors that are not standard.

There are actually three lines - one from the transmission to the left side of the engine coolant radiator, a short line from the engine radiator to a small, dedicated cooling radiator, and then a return line from the dedicated radiator to the transmission.

The outbound and return lines are segmented - within 18” or so from the transmission they feed into a thermostat valve block, which bypasses the cooling loop until the transmission fluid is warm enough. Maybe re-use that valve block.

86k, possibly a lot of life left!

You are exactly right regarding the format of the lines, and my leaking line was due to corrosion beneath one of the polymer clips. One part number (6LIZ-7R081-AA) consists of two of the lines, which are my concern. Given the reported failures of these lines, you would think Ford would start cranking out replacement parts—or a third-party vendor.

 

[whtbronco]

Ford has no interest in helping you maintain a 20yr old vehicle. They would much prefer to sell you all new parts. Dorman seems to be adding production for some new parts for older vehicles lately. I'm not a huge fan of Dorman, but their metal parts sometimes really are terrific.