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2008 se5, 50k miles . symptom: engine heats up to 6 or 7 bars on hard accellerations, worse in hot weather. tried everything to no avail. solution: replaced water pump impeller and housing, $65. easy to inspect and replace. the plastic impeller is molded to a brass nut mounting it onto the drive shaft, impeller rotating freely onto nut. may be a wise carry on for you high mileage spyders.
Is your fan coming on when it is supposed to?
Are you going into limp mode? If not you are not, then you are not overheating. Although 6 or 7 bars is a bit of a high indication I have run mine there in stop and go traffic.
Most likely cause is a bad fan relay. If your fan is not on by 6 bars I would swap out the relay and see what that does., I just change my relays every 3 or 4 years as they seem to go belly up and they are cheap enough to replace.
absolutely overheating, fan on but noted air flow not very hot. likely due to poor coolant flow between engine and radiator. if you notice a different pattern to your temp gauge reading, have the water pump impeller inspected or do it yourself, very easy/inexpensive.