200TDI cooling

can someone let me know if this is normal. I replace my temp guage with an aftermarket one inc sensor, i have a 88deg thermostat too. when running the temp goes to about 85-90 when plodding around, when im going about 65mph it's about 92deg and when i'm doing around 70-72 it's around 96deg, does this sound high. just i know people say the 200tdi run cold ish. the viscos fans spins on idle, not sure about full speed though. i want to see if this is the norm before fitting things like new water pump etc.

Sounds OK to me - the system pressurises ok I take it ( when hot the pipes are a bit hard )

yeah it runs fine, heater inside blows nice and hot, just a bit worried as people say they should run cold ish and mines creeping up near the 100deg mark on full wack on the motorway.

the coolent tempature can exceed 100c because it is under pressure and the precance antifreeze the is some evidence to back this up below
hope this takes away your worry


" Pressurization
Modern automotive cooling systems are slightly pressurized. This raises the boiling-point of the coolant and reduces evaporation.
Antifreeze

The use of water cooling carries the risk of damage from freezing. Automotive and many other engine cooling applications require the use of a water and antifreeze mixture to lower the freezing point to a temperature unlikely to be experienced. Antifreeze also inhibits corrosion from dissimilar metals and can increase the boiling point," Water cooling - Wikipedia, the free encyclopedia

"Conductive heat transfer is proportional to the temperature difference between materials. If engine metal is at 250 °C and the air is at 20°C, then there is a 230°C temperature difference for cooling. An air-cooled engine uses all of this difference. In contrast, a liquid-cooled engine might dump heat from the engine to a liquid, heating the liquid to 135°C (Water's standard boiling point of 100°C can be exceeded as the cooling system is both pressurised, and uses a mixture with antifreeze) which is then cooled with 20°C air. In each step, the liquid-cooled engine has half the temperature difference and so at first appears to need twice the cooling area." Internal combustion engine cooling - Wikipedia, the free encyclopedia