My Captiva 2011 135 kw manual also doesn't work 4WD. I just bought it and it didn't work at the beginning. So diagnostic don't find any mistakes, also during the test, we found what 4 veels don't work together, also you can easy to turn cardan witch is going to rear differential and it rear veels go well. Any noise in the transfer case.
So my assessment is that could be middle Drive shaft (part 26) removed, because of any noise, the transfer case is not broken. Before total removal transfer case, I am going to remove from the back part 37 and look inside, how it looks. I also already ordered new 4 bearings, as I understood the middle shaft right side bearing is the weakest point. I also started looking for used transfer case, it also not easy and prices are around 500 eu (new one around 1500 eu). I sow that it is different numbers for automatic and manual gears auto. If my transfer case corpus is good I can change only inside parts, it easy to find.
Is it any differences in transfer case inside parts for manual and automatic auto? Thanks.