Older car, heat and extreme driving conditions. Your radiator or fan not be working at 100% capacity. enough for everyday conditions but not suitable for being pushed.
And why were you doing such a long climb just in 3rd anyways!!!! If nothing happened to the motor you can risk overheating and causing permanent damage to the transmission.
Ive driven up and down Jabel Jais a dozen or more times there are only a few places an auto trans hunts for a gear.
Only time I use the manual triptronic is when coming down to use some engine braking and not just rely on brakes and avoid brake fade.
continuous revving on lower gears makes the the coolant expand and spit out of reservoir...when doing such kind of driving ensure to keep an eye for the temp. gauge and oil pressure gauge...well leave it to cool off nicely and top up with coolant or water and bleed off the system if equipped with such
keep an eye in the radiator cap place and see if any bubbles are coming up if not then all is good
P.S do the last step when car is sitting up all night or at least such time has passed to gauge the damage if any that occured or else better yet let some professional mechanic handle such things
there is high risk of cap flying off and you burning your self
I stand by my comment. It was showing an indicated 100 mph on the clocks. Ok, so maybe with adjustment it might be 90 mph but trust me, my granny beat my ass with a stick so hard that I am still traumatised to this day.