That's very good to hear, Paul
The water temperature sensor can make a real mess on this enigne. For some reason they have a tendency to fail. It usually only causes cold-running problems, but it can also cause warm-running problems. On my car, the sensor had periodic problems and luckily failed once while the garage had the car on diagnostics computer. Suddenly the engine would start running rough in idle and the water temperature show -40 degrees or so. A moment later it would be back to normal. Replacing the sensor fixed the problem.
Yes, french cars can be a pain to work on. But they look better than other cars!
Cheers,
Anders