Specifically how hot does your Rover run, how hot is too hot, and things you might do about it.
Friday on the way to Signal Peak I was running up I80 in the D1, taking it fairly easy at 65-70. I had the a/c on and of course it was quite hot out - somewhere in the upper 90s I'd guess.
The stock temp gauge has proven to be useless - it's less a gauge and more like a warning light that only moves if you actually overheat. Using my scangauge I can monitor real-time engine temps and see it holding in the 205-215 range while climbing. Running on flats it still runs around 205 at 70 mph in similar heat with the a/c on. Of course the stock gauge climbs to just under mid-scale and stays there no matter what. I've never seen it anywhere else even with the scangauge showing between 180 and 215.
First, I'm not happy with that much temp. It's one thing for it to run that hot climbing but it's still warmer than I'd like at highway speeds. I'm not sure what temp the thermostat is but I'm not sure a lower temp unit would make much difference. Let's say it's a 180* or 190* thermostat - I'm constantly running above there so opening at 170* wouldn't actually lower the engine temps.
The radiator is a newer genuine part in good shape and the stock viscous fan appears to be working correctly. I have the standard trans cooler as well as a power steering cooler and a/c condenser.
It seems the logical solution would be a bigger radiator. The truck does have a 4.6 in place of the original 4.0, but I doubt the D2 4.6 radiator is actually any bigger or more efficient.
Before I start thinking about a custom radiator, what temps do you guys normally see on your rigs? This would be most useful if you have an aftermarket temp gauge since the stock part has shown to be so unbelievable.