This happens when one of my fans is not working (I blow fuses 2x a year for some reason).
Check your radiator fan operation by bringing the motor up to temp, turn your AC on to COLD, get out of the car, and put your hand on the ground in front of each front tire. You should feel hot air blowing on your hand and hear the fan operating.
If you don't, check your fuses. If a fuse swap doesn't fix it (and I always swap fuses out with new ones, even if they look good just because they're cheap) you have a radiator component issue.
There's usually not a lot of movement on the needle on my car unless one of my fans isn't operating properly.
97-2004 Boxsters have REAL temperature gauges, btw. This means it actually moves around when the sensors measure more or less heat. 2005 and up Boxster have what most other cars have... a temp gauge that jumps quickly to a set place on the gauge face and stays there until you're in an emergency situation and then pegs out and a warning light comes on.
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