Tribeca coolant system bleeding

[Brom55]

Hi all,

A strange request maybe,but after having a new thermostat (OEM from US ), the temp on my Tribeca is wondering near to the limit mark of normal range,(just before the red zone).

Garage did the work and have since checked stat was opening which was confirmed,and replaced with another stat to check if any improvement,but not really made any difference as temp still above half way, which was the normal temp prior to the new stats.

Engine was replaced due to original HG issues and current engine only done 40k so unlikely to be another HG issues.

I feel maybe the coolant system may need bleeding as only thing I can think of.

Any special procedures or advice taken.

(unless anyone close to Chesterfield,Derbyshire has knowledge to come and show me ).

Thanks in advance.