hi guys . Each morning my temp gauge rises to 90 as per norm then increases /decreases above 90 to sometimes just above red square for anywhere between 30 mins to 45 mins then decreases back to 90 and will run as normal all day ( taxi ). Coolant level is good oil level good was hoping someone can advise possible cause . Thanks 

Probably the water pump needs replacing, common on the superb!

Thanks I’ll get water pump checked out /replaced