Try a 10oz bottle of lubegard redI was getting this shift flare on the first 1-2 sometimes 2-3 with medium throttle and the first shift of day. Only happened when car sat for a while and temps were 50~F and doesn't happen all the time.
I changed the fluid with Valvoline Maxlife ATF. I thought if I changed the fluid, it would go away. The fluid was pretty dirty for only 30k so I'm glad i did. Around 4qt came out and I put in at least 4.5qt (spillage). Also, the car was already somewhat warm as I had to drive to my parents to use the jack (live in apt). I did the level set at proper temp, etc so I'm pretty sure its not a fluid level issue.
Car only has 30k, so I'm wondering if this is normal operation due to "warm up" or engine running rich. It doesn't happen on light throttle. Anyway, I plan to do another D&F this weekend with around 5 liters. When the car warms up it shifts like a dream, even better than before. Only thing I can think of is the car was underfilled from the factory, and I should've put in a little more. The shop manual calls for 5 liters on a refill then level set.
Looking for insights here. Thanks.
After 500kms this will eliminate your shift flare.
We had a 12 santa fe and just bought a 19 santa fe.
Both had the issues you are experiencing.
Libegard and a drain and fill of maxlife aft. Issue fixed in both Hyundai's.