[fchen7]

I am trying to install a transmission cooler to my 2017 GMC Canyon Diesel. I was going to bypass the radiator and only using the new transmission cooler i purchased online. I thought i will need additional cooling, i will be towing a 3900 lbs 5th wheel travel trailer soon.

See pictures included. I found what look like transmission lines attached to bottom of radiator. I loosen the bolt on the right side of picture, and coolant fluid were coming out. So i am very confused. Are these transmission fluid lines ? If they are, is there metal tube that runs inside the radiator and the metal tube is surrounded by coolant ? (that will explain why coolant leaks our when i loosen the bolt).

If these are transmission fluid line, i can cut the rubber hose and connect transmission cooler in middle of the hose. Good idea ?

thanks for any advise.

frank

 

[gaz71]

Yes, those are the transmission cooling lines.Push back the plastic boot/cover onto the cooling line, once that is done you will see a metal clip that you need to pry off/remove, at that point you need to give the line a lug and it will come out.

 

[Vinolush]

If these are transmission fluid line, i can cut the rubber hose and connect transmission cooler in middle of the hose. Good idea ?

thanks for any advise.

frank

https://www.etrailer.com/Transmission-Coolers/GMC/Canyon/2017/D13502.html?VehicleID=20174042328

 

[SFLTruck]

https://www.etrailer.com/Transmission-Coolers/GMC/Canyon/2017/D13502.html?VehicleID=20174042328

I don't see why not, the age old question is do you do it prior or after the stock cooler....

 

[hotrodfeguy]

I always run the cooler post coolant/rad. Just an extra amount of cooling. Cause if the coolant takes the fluid to 200 then you have cooler fluid going in when its needed on hot days.

 

[Vinolush]

I don't see why not, the age old question is do you do it prior or after the stock cooler....

My thoughts are after....

 

[Hossryan]

Do you know which line is on the return side. I am about to cut into, post cooler, but don’t have an idea which on it is. Driver side/ passenger side? I tried checking with an infra red thermometer but couldn’t confirm.
I always run the cooler post coolant/rad. Just an extra amount of cooling. Cause if the coolant takes the fluid to 200 then you have cooler fluid going in when its needed on hot days.

 

[Vinolush]

"Inlet (from transmission) on tank cooler is passenger side; outlet (back to transmission) is on the drivers side."

This quote is from this link...

Auxiliary transmission oil cooler

So I removed some plastic and traced the trans oil cooler lines on my diesel last weekend. It appears that the only transmission oil cooler is the one in the bottom of the radiator. Seems like a stupid move to put an external one on the V6 but NOT on the diesel that is highly likely to be used...

www.coloradofans.com

 

[hotrodfeguy]

Wipe lines clear of atf dripping out or have them point up. Crank engine. Whatever side has some atf is the outlet from trans. This way 100% you have the right line. The few seconds you turn it over will not matter.