[Doctor W]

I've had quite a few land+range rovers and they have external fluid to air cooler auto trans coolers and then fluid goes via thermostat into "hot " side of radiator or back to transmission they also have a thermostat that stops fluid from going to getting cooled at all, further they also have an engine oil cooler in the cold tank of the radiator, and a fluid to air transfer case cooler.......this full house of coolers are fitted in vehicles that are meant for hot climates......for cold climates they run things differently, to keep fluids warm enough.....i had a range rover and a discovery which had electric elements in the windscreen glass ( not copper printed!) and the discovery had a separate diesel interior heater that could be run while engine was off! scotland is cold! ......truth is Rover builds all sorts of climate specific cooling (and heating) arrangements.....that's one sad point about jeeps, they're pretty basic- nice and simple which is a real plus point really!, but cheap for parts by comparison.