The car had a pretty thorough maintenance of the selespeed/dualogic unit a couple of weeks ago and behaved perfectly for about 150 town and motorway miles. Very smooth. The selespeed oil was a little low, but that was the only thing the mechanic noted. I think he replaced the fluid. Clutch retrained, sensors cleaned, ECU reset, and probably some other stuff I've forgotten.
But then it went wrong again. Now when it gets hot, it begins to refuse to go from 2nd to 3rd (no problem from 4th to 3rd). Also the shift down from 5th usually dumps me into neutral again when the engine's hot.
The error messages about the temperature and radiator liquid still come up when I first turn the ignition on.
Paul at Motormech's been great. At the moment it's booked in with him next week for a probable gearbox rebuild -- but is this really the problem? That's what I can't figure out. One guy at another garage jumped straight in with a diagnosis of faulty actuator but he'd only has a ten word sketch of the problem when he came up with that. Not very confidence inspiring.
Another, much better garage suggested that a main dealer could a) provide better diagnostics through their examiner and b) do work with the understanding that if the work turns out to have been unnecessary, I don't pay for it. I'm not sure about all that. Paul at Motormech said his examiner gives exactly the same info as a main dealer's would. I'm inclined to believe him. And his says bugger all about the faults I'm getting.
The other little thing I've had done is the contacts on the rear light cluster, in case some wacky signal was confusing the ECU. That mechanic didn't work on the switches though because he didn't know which was which. There was significant corrosion on the earth pin on one side - not the side with a reversing light.
I'm really, really confused. Which, admittedly, isn't that hard.