2013 new owner towing report

[Costal_Cat]

What @swathdiver said above ...Radiator after the cooler

 

[swathdiver]

What @swathdiver said above ...Radiator after the cooler

I wrote that wrong initially, should have gone to sleep!

 

[gooffeyguy]

I as gonna say, it should run through the radiator first, then the cooler, and back to the transmission

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[cycho]

I wrote that wrong initially, should have gone to sleep!

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This is what makes sense. Use the radiator as a pre-cooler. It would seem that if I routed to the radiator last, the radiator would reheat the trans fluid to what ever the water temp was (over 210).

Thanks

 

[cycho]

Now which line is which top to bottom?

 

[97audia4]

You can make the stock lines work with fittings to the 40 k cooler, flip the bottom bracket drill holes and reuse the stocks bolts. I made the bracket 1/4 aluminum.





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[cycho]

You can make the stock lines work with fittings to the 40 k cooler, flip the bottom bracket drill holes and reuse the stocks bolts. I made the bracket 1/4 aluminum.





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I don't have a stock one. I have zero. Which line leaves the radiator to return tot he trans (our cooler in this instance) The bottom line from the radiator would make sense.

 

[swathdiver]

Now which line is which top to bottom?

Fluid comes from the transmission and enters the bottom of the radiator and exits the top fitting. This is to keep air pockets from forming. So the line coming out the top of the radiator goes to the external transmission cooler. When we used the tube/fin style cooler, the exits were on the side and we plumbed into the bottom first and then the return came out the top. With them facing down, I reckon that it doesn't matter unless the manufacturer says so.

 

[Ilikemtb999]

You can make the stock lines work with fittings to the 40 k cooler, flip the bottom bracket drill holes and reuse the stocks bolts. I made the bracket 1/4 aluminum.





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Wow she’s a beaut! Any more info on parts needed?

 

[Costal_Cat]

Fluid comes from the transmission and enters the bottom of the radiator and exits the top fitting. This is to keep air pockets from forming. So the line coming out the top of the radiator goes to the external transmission cooler. When we used the tube/fin style cooler, the exits were on the side and we plumbed into the bottom first and then the return came out the top. With them facing down, I reckon that it doesn't matter unless the manufacturer says so.

Doesn't matter but I just matched to my stock one with the Trucool

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[Costal_Cat]

Wow she’s a beaut! Any more info on parts needed?

I did the same using most parts that came with the Trucool pack ... I did get transmission line adapters that screwed into the trucool. I cut the original lines with a small tube cutter and then extended them with rubber lines
Here is a pic before clean up

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[97audia4]

Wow she’s a beaut! Any more info on parts needed?

If you have the stock trans cooler all you need is a bolt kit of your choice, local advanced Auto parts has them .

One flat bar of aluminum and a way to cut it. The stock lines are thin and you can heat and bend them easy. Also need to trim the lower plastic panel. Napa has the fittings for the 40k cooler to work with stock lines .

The bottom mounting bar just needs flipped over and trimmed , you can reuse the stock bolts . I'll get some detailed pics this weekend .

 

[Ilikemtb999]

Can the stock ends of the hoses fit the new cooler? That’s more the part I’m unsure of. Getting it physically mounted seems easy enough.

 

[97audia4]

Can the stock ends of the hoses fit the new cooler? That’s more the part I’m unsure of. Getting it physically mounted seems easy enough.

Yes Napa has the fittings for the cooler to work with the stock lines but you have to reroute and bend them a little

 

[jamoody]

I installed an external transmission cooler on my 2017 Yukon before setting out on a cross country trip last summer towing a 4K pound trailer. The dealer told me that the transmission cooling valve opens at 195F, and my towing experience on the flat confirms that (transmission temperature rises to 195F and then stays there going no higher). While towing through the Rockies from Canada to Mexico up and down long 6%/7%/8% grades the transmission temps sat at 195F most of the time, reaching 210F a couple of times for a few (10) mins while climbing mountains in the southwest and then dropped back to 195F on the descent.

The external cooler worked like a charm. Because the transmission was running cooler it wasn't dumping all that extra heat into the radiator which kept the engine coolant at normal operating temperature even during the climbs. I'm confident that you'll do fine with the added external cooler.