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I never really noticed with mine, but I'd assume your temp gauge is yoyoing because the cooling fan is running fast.
Is the code from Planet or a generic reader?
Ignore me. I haven't had an RCZ for a few years, and for some reason my cold addled brain thought it was a cable. Then I realised they weren't made in 1984.
Is bleeding it an option? I know you can on other cars, just over fill the clutch fluid reservoir and then bleed the slave.
I only ever used Diagbox or PP2k on my Peugeots. I made the mistake of taking one of my 407s to a "specialist" and they couldn't even access the dial cluster to remove the TPS flag that you need to when you fit rubber valves to them. So for about 2 months I kept getting beeps and flashing...
Probably nothing less than Diagbox/PP2k. Unless modern generic obd stuff is better than the ones I've used in the past.
I didn't have Diagbox when I had starter motor problems, so didn't have it on hand to play with.