Had you been using your cruise control on the motor way ? I only ask as your car uses the rear brakes only to help maintain cruising speed so can often lead to hot rear brakes
Yeah back to 2 valves 1 hot water in 2 out there positively energised so always open and close as the temp control is turned down and fully closed on cold setting.
They fail often think iv done mine twice the rubber seals break down.
As your looking at the engine bay from the front of the car it's deep down on the right hand side bulk head. You lose a bit of coolant when you swop it out but it's not a drama
Heater control valve takes 20 mins to swop out if your having tea at the same time. The hoses are very bendy and you can pull them a fair way out for better access...
I don't have adaptive counting headlights either but I do have the headlight self leveling headlight module.
It's located passenger footwear, pull the kick panel off and it's up on the left just a little bit.