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I purchased my fifth Rover, a disco 2 about a year ago and have replaced the water pump, thermostat (soft spring), fan and fan clutch and have done a complete flush on the system and am running conventional green coolant in place of the dexcool. Last year it was running great on the highway at a steady 194 degrees. Now, it actually runs hotter on the highway than in town I have seen temps up to about 217. When it gets to higher temperatures it takes a while to cool down unless i turn the heat on (which is one of the reasons it makes me think radiator) The truck has never overheated since I have owned it. My thoughts are its one of the following 1) radiator needs replaced 2) head gaskets 3) paranoia on my part (mostly due to overheating my disco 1 and getting slipped liner)