Canadian Hummer Club Forums

Just installed the H2 external transmission cooler and completely by-passed the radiator internal cooler. Now i don't have to worry about the coolant mixing with transmission fluids when the radiator internal cooler go. 
 
I used this http://www.amazon.com/gp/product/B0060NKA1U?psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s00
 
Also, did this:
replaced transmission filter, transmission pan and gasket (old pan we're dented from off-roading)
completely flushed the transmission fluids with oem dexron 6 and reset transmission fluid life to 100% with Tech 2
replaced transfer case fluids with oem dexron 6
replaced front and rear differential fluids with oem 75w90 synthetic gear oil
replaced rear brake pads and parking brake shoes
replaced torsion bar cross member bushings
 
Serviced front brakes
Need right rear parking brake cable, siezed, parts on order.
 
Road test result with the new external cooler (about 20 km distance), will update for long term use:
54*C at idle with 90*C engine temp.
65*C at 110 km/hr with 28*C outside temp
 
I used to run around 98*C with the stock tranny cooler.
I will see if i need to install the by-pass valve in the winter.
 

 

 

 

 

Nice and clean!!

Sweet!!!
 
But you beat me again!!! I was planning that exact mod with the same part?? Did you get the special thermostat bypass for the cooler to help the transmission to warm up in the cold??
 
Really Nice work as Always!

I didn't install a thermostat bypass yet as i have to see if it's really needed in cold weather. If i do, then i'll install this 
http://www.improvedracing.com/oil-thermostats/high-flow-transmission-fluid-thermostat-165f-p-423.html

Why not the one from Tru Cool??

bad experience from actual truck owners.

Good to Know!!!

Hey Jimmy,
 
By some chance, did you take any pics of the cooler lines under the cooler and how you connected the new cooler to the existing lines?
 
Thanks,
 
Kev

Kev, sorry for the late reply i didn't see your post. No, i didn't take any pics under the cooler. It's just a simple connections, i just used the supplied transmission hose from the kit, cut it to fit both lines and directly connected it from the new cooler straight to the oem tranny cooler lines that i removed from the radiator and the old oem external cooler lines. Very easy mods to do. I just came back from Boston and my max tranny temps is 75*C at 28*C outside temp. through the mountains.

***Update***