Hello people, I know it isn't a Kia but it's close and I rather deal with Kia owners here and maybe this will be as far as I need to go
My sister's 2007 Hyundai Santa Fe has 168k without any prior problems and has never serviced the automatic transmission either, the fluid is a brownish pink and has a "working fine" smell and not a burnt smell. Fluid level is about a pint to much because before they contacted me they put that Lucus transmission crap in it but did not tell me this until I told them someone put something in it because they spilled it all over the battery like they tried to add it without a funnel.
When you first start it you can go into sport mode and put it in first and it will remain there until you up shift it to 2nd, when you upshift it; it jerks and bucks then goes to 3rd without upshifting, from there on it will not go back into 1st until you shut it off and remove the key, wait a few seconds then you can repeat the same function.
If you start off going directly into drive it will start in 1st then within a second or 2 seconds it will go straight to 3/drive. It will remain there until you shut it off and repeat the start up.
The transmission does not feel like it is slipping at all and functions well but will not downshift. I plan to remove the pan and check the filter and see if there is a restriction, it seems as if it has a restriction because it jerks and bucks before changing while using sport mode and at that moment it seems to slip for a second.
That's about it right now, I will not do anything until tomorrow (Sunday)
I hope you people can assist me and give me some ideas.