Hey guys I'm new to the group. I have a 2012 Kizashi SE, it has 100843 miles on it. Long story short, if it gets to freezing temperatures or below freezing and I first start my car up I let it warm up until the RPMs go below a thousand. After the car has started to warm up some I shift it into gear and it shifts so hard it shakes the car. I turn the car off and turn it back on again and it will shift just fine... if I do not stop the car and start it again, it will go 40 miles an hour at about 2500 rpm which I am assuming is second gear... it only does this when it's cold outside during the summer it runs just fine. It did this last year but this year it has gotten worse, now if I go 10 minutes down the road and kill it, once I started back up again no matter what I do after I drive it is the only time killing it will fix the problem. I've been told lots of things from lots of different people. I am afraid to change fluid and filter in transmission because I have had very bad experiences in the past with that. Start out with a minor transmission issue change the fluid and filter turns into no more transmission.. I've searched through all the forms everybody talks about warm weather affecting their car, mine is quite the opposite... any ideas guys? If it's above 45 degrees Fahrenheit I have zero problems, if it gets well below freezing I have nothing but problems.
For starters, you should know that the Kizashi's automatic is a CVT (Continuously Variable Transmission). These actually don't have gears to shift.
As for the issue, I'd start with changing the fluid. At 100K, it's overdue. You did mention your hesitation on it based on prior experience but when done properly, it will only improve things at all temperature ranges.
Also, if you think that the vehicle's CVT performs better after restarting the car after an initial cold run, perhaps it needs a reflash or update to the Transmission Control Module. I'm not too versed on the details given I personally own a manual transmission but I really think new fluid would help.