Chosen Solution
My transmission is overheating and I don’t know how to add a cooler for it
If you’re Transmission is overheating I would suggest to look up on YouTube your card year and model “How to check Transmission fluid” And than take it to your local trusted repair shop if possible. A Transmission “Cooler” is not a real thing sadly.
Auto trans uses two hoses from the bottom of the radiator.I have a manual trans, but the radiator which i beleive was fitted once is for auto trans. This 2004 Tiida au or Versa US is the worst car i have ever had to work on. I do have the manual for repair work. Try manuals on line to source it or contact me at razorblade1945@gmail.com for the coolng system page.