This is my first posting so bear with me...
My question relates to a problem that seems to have been covered quite extensively, but none of the answers seem to cover my problem exactly.
I have just bought a 1992 fourtrak 2.8TDX. It looks immaculate and has a full main dealer service history up to 106K, and has been serviced privately since then, (now 119K).
I drove it home along both motorway and country lanes for about 100 miles. Along the lanes there was no problem with the temperature. On the motorway up to about 65mph, again no problem. Over that, (max 80mph) the temperature gauge rose quickly towards overheating, although never quite reaching it because I reduced speed back to 60mph which saw it almost immeadiately lower to normal levels, ( about halfway on the gauge).
The problem was particularly bad when climbing hills at above 65mph.