Engin's running too cold?

[dom14]

I dunno, I get the theory of thermostat keeping it that way..But my rig did the same with an old and a new thermostat. Going on a long downhill run it'd cool down a bit. My old Hilux did the same. They'd do the same if I just left them idling for ages, they'd just keep cooling down slowly. I don't know if once open, they don't close fully until a certain point or what, but it hasn't worried me.

What I have noticed now is that the auto choke (which I've had issues with previously, but thought i'd adjusted it enough to sort it) I believe is coming back on after a drive in cold weather, as it idles high for a bit when I come back to a standstill until the carby seemingly warms up a bit again and the idle lowers. Might wind the auto choke off a bit further.

Yeah, playing with the auto choke can help during the Melbourne winter, or any season in Melbourne, considering we tend to get all four seasons in a single day sometime.
But, RB30 and TB45 electric auto choke is not that smart or effective all the time. Auto choke opens up by heating bimetal coil electrically via alternator trigger line activated auto choke relay, not by responding to engine, carby or intake air temperature. Once the auto choke flaps are opened, it tend to stay that way. AFAIK, the the bimetal spring doesn't unwind itself in cold weather to cause the mixture to become richer. This is why sometime it can help turning the auto choke either way, depending on the weather/climate.
It is possible to improve the auto choke further to make it more "intelligent" to respond to intake air temperature and engine temperature, but I reckon the effort is probably put into a better use with an EFI conversion.