Originally Posted by Savannah Buzz

I like the design of the D1 with two electric fans, perhaps those D2 owners in extreme areas could add a second fan if cooling at idle and slow is a problem. But if you are on the highway, once you get to 204 the stat is wide open, and the water pump and radiator square inches become the limit factors. Unless you put an aftermarket oversize fan on, even then the change would be slight compared to the 50 mph breeze through the radiator from forward motion. Obviously a clean rad without sludge or calcium buildup or bug and mud plaster is a plus. The 180 stat is great for overall driving, but you will warm up from there when slow because of air speed and size of radiator, which the base temp does not change. How long it takes to warm up to 212 would be changed, by starting at a lower temp (driving and then stopping for drive thru, etc.).

And if we agree that 220 is too warm, and 240 very bad.... all the more reason to buy an Ultra Gauge - since Rover temp gauges are "optimistic" by design.

Also, in the summer, you can run cooler with just water and Water Wetter, as compared to 50:50 coolant mix. See WaterWetter® Tech Info. With a 15 PS cap, water would boil at about 250F, and we certainly are not running there hopefully.

Originally Posted by jfall

Here is probably a good way to wreck your transmission