Need some help diagnosing my 2002 Disco SD .it has 130400 miles. It is having overheating issues. So far i have replaced the thermostat, the radiator, radiator cap, and upper radiator hose assembly. The oil is not milky, it gets good power, no significant oil leaks. I got this vehicle a couple of weeks ago. I was told it needed new coil packs, and the catalytic converters had burned out and been removed. I had the coil packs and cats replaced, and it drove good for a week or so, then it started overheating. The first thing i noticed was the upper hose assembly was not OEM, it did not have a relief valve, and there was a hole over the fan shroud in the hose where it looked like something was supposed to be inserted but was missing. Since air was venting and spewing coolant i replaced that with a oem upper hose assembly that came with the relief valve, at the same time i put a new thermostat and radiator cap on it. It kept overheating... after further investigation i noted that the plastic piece that protrudes from the top of the radiator had broken off, and a diy fix had been attempted. Coolant was leaking from this point. I bit the bullet and got a new radiator, and installed it. I am continuing to have overheating issues, any advice? My next step will have to be to take it to the Land Rover dealership and have them diagnose it. No local shops deal with Land Rover, so i will have to have it towed to the closest dealership about 70 miles away. And that is gonna cost about 160 just for them to look at it. Sorry for the wall of text, i want to give as much info as i can to assist in diagnosing issue. I appreciate any help in advance.