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I just did 450 miles on the highway, which of the last 150 miles I drove above 93 mph, and then on a downward hill, it topped 122 mph and ran about 20 miles at this speed.. Stock 2.0 HDI not remapped, and with 307.000 miles on it.

The ting that makes me open the topic is. When I turned off at my intersection/junction/exit. I clutched out to make the engine idle, when I came to a full stop and turned left, the temperature touched 100c, then 10 sec after that, it was at normal operating temperature.

I am thinking right now, that this is quite normal, because I clutched out right after high speed at the intersection, leaving the "warm" engine left with idle rotation of waterpump, and the engine-coolant reaches 100c, when the fan kicks in, and therefor 10 sec after the temperature is back to normal "90", firstly because I started driving again, and secondly because the fans were helping.

Dose anyone have another idea, or do you ALL agree on my 10-cents on this issue. In other words, in the same scenario your "hdi" engine would/should probably act the same

Thanks !

I agree with your theory. When the fans kick in, they bring the coolant temp down very rapidly indeed

That´s kinda nice to hear ;)

2000 miles ago I had to replace the cylinderhead with a used lower millage one, and a new headgasket plus waterpump and ect.

Because prior to that repair there was CO2 in the coolant at 4x rpm, at highway speeds the exhaust gases would heat up the coolant temperature to 120c if I drove past 80 mph, below that the symptons were not visible.

So that is were my concern lies, but If anyone else have had there engine temperature reach 100c, or just driving in a way were the fans kicks in, I would like to hear about it too. Because its hard for me to imagine a scenario were the temperature reaches 100c in these HDI engines. Caravan driving would be easy to imagine, mostly on a long steep hill, but otherwise it just shouldn't reach 100c in my theory.

On my recent holiday to France, I climbed many steep hills in hot weather, with the car fairly well loaded, (4 people, 2 dogs, plus luggage), but at no time did I see any change in water temperature. There was dramatic change in the oil temperature, (which reached 1 division below 140 degrees on the steepest climbs and dropped as low as 90 degrees on the descents), but if there was any movement in the water temperature it was so small as to be indistinguishable.

Sorry, but I think your car may still be overheating.