Hi everyone,
Just joined, I live in Australia.
Have had XC90 D5 2 yrs and delighted with it. Off-road ability surprisingly capable with torquey diesel motor and 16:1 1st gear plus traction control compensating for limited supsension articulation (have had 1 wheel 2 ft off ground but still kept going!)
However I sorely tested its limits in heavy soft-sand driving where after a few kms of great performance through dunes we suddenly reverted to 2WD on the beach, below the high tide mark. Dug ourselves out and after 5-10 mins 4WD restored but again after a few mins back to 2WD again, and again, until we eventually dug/drove ourselves out!
I concluded the Haldex system had overheated and from what I understand of it there is a temp sensor on the oil which disengages the clutch above 100 deg C.

Anyone familiar with this? Any aftermarket fixes to manually lock into say a 50/50 front/rear split? I believe Haldex have new controllers but seems it is all about pre-emptive response, presumably still relying on oil system and still prone to overheating.

Look forward to your bright ideas.

 

Welcome. Check out the XC90 forum to see if any of your questions have been answered.