Just got one of those myself! It's a late 97 with 7k miles on it. The previous owner wasn't using it much cause he'd get so many stares. It's a Vitesse with a yellow paint job. The interior is black with yellow piping as well.
I got it despite all the warnings I've received...Dad has two of em... a 96 4.0 SE with 4K miles (parked mainly in the beach house so it sees very little use) and a 97 4.6 HSE with 16k miles...and it doesn't cost as much to maintain as people would have you think.
The trick with these Range Rovers is (and I can't stress this point enough) religious and preventive maintenance. In my experience, the more you use the car, the less problems it develops (we were extremely luck with the 4.0). What you should look out for are the front air springs (the minute the car loses ride height when parked, have the air springs checked right away...they're $125 a piece, should last two to four years...but if you neglect them, it will ruin the valve block--which controls the air springs--and it costs $1000!) The exhaust can be a problem as well. It tends to rust right before the rear muffler as the tires tend to kick up water on them.
I'm lucky I guess cause my mech (an ex-marine) came from CA where he used to work for British Motors or something like that. He does home service, charges $50 an hour on 0.1 hour increments and doesn't seem to make a much of a profit on parts (I get em from him at cost plus freight and they're always cheaper than getting them from the local dealer or from US dealers even!)
They're a hoot to drive, look really classy, engine and tranny will take a beating, and it'll take you anywhere (almost). And the women love it when you put it into access mode so they can get on and off easier.
For lotsa info on these, check out RPI Engineering at
www.rpiv8.com. Great site...and lots of mods available for the Range Rovers.
Good luck. Oh, and I'm willing to bet it's just a clogged radiator vs. a bad block.
Cheers!