Hello, the first thing you should find out is the 1000 motor trab temperature, I distrust it, if it is as Kikemec says then the operation is normal.
If you can place a bulb with a different range of work if that reassures you.
As for the heating radiator, it is convenient that it is working, in addition to heating in winter, this allows a resource how much it lifts a little temperature and the knob of the cold board is, you quickly take it to maximum heat and the engine temperature goes down several degrees.
As for the thermostat if it does not lot, there is an obstruction less in the water circuit and it will cool more because it circulates greater mass of water, it is that in winter the engine will work a long time to reach the regime temperature. Do you know how many speeds the scro of that goal has? Well, it may be that the relay coil only coupled to the second speed, this happened to me in a Siena, when I had to attach the first speed I was sparkling one of the chips of the coil and recently just when the temperature was further coupled the second (faster) that normally always worked in the lowest.
I hope I have been clear. Greetings