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Thanks everyone for the kind suggestions. This site is a great way to get ideas for troubleshooting! During a tinker today: 1) I tried burping the system and got virtually nothing out. 2) Fitted temp probes to the engine block and the top hose to monitor temps during engine warmed up to test...

Thanks landowner. Makes sense, but that was the first thing I tried. The new sender seemed to make only a v slight difference to the dashboard gauge reading. That's why I thought of the thermostat next up. Running without it - gauge reads normal. New thermostat in, back to the same problem as...

Thanks Anaconda. Yes, the measured temp seems great but the gauge on the dash reads only just under the red section and it's bad for my blood pressure. Running without the thermostat fitted, the gauge reads normal. That's the mystery.

Thanks Landowner. The system seems to be getting hot. About 70-90 oC (depending on what device I use to measure, where I put the thermometer probes, how hard I work the engine) but no sign of overheating.

Very many thanks kermitt rr. Interesting idea. Isn't one of the jobs of the jiggle valve/pin in the thermostat to avoid that? Then again, maybe the air lock is elsewhere in system. I think one forum post mentioned parking the car on a slope to have radiator as high as possible and then refill...

Thanks for the quick responses and welcome guys. I have reposted my Q in the 'series' area of the site and here is a pic taken at last week's Gnoo Blas Classic in NSW Australia (my local club's annual event). Thanks for the answer Diddypud. Yeah, pretty confident I fitted the new thermostat...

Hi Landy fans. I'd appreciate any pointers on what to try next with my series 3, 6 cylinder petrol which I have been sorting over the last couple of years. It always ran with temp gauge nicely mid range but last month suddenly the needle went to the red zone after warming. This was after a...

Hi Landy fans. I'd appreciate any pointers on what to try next with my series 3, 6 cylinder petrol which I have been sorting over the last couple of years. It always ran with temp gauge nicely mid range but last month suddenly the needle went to the red zone after warming. This was after a...