Err don't flame me but Even though you have mechanical seals on the pump you will get some leakage, it to do with fluid shear between the seal and the shaft. basically your seals rely on the fluid to stop the seal melting and keep it lubricated. Now what happens is the friction the seal creates heat the fuild so you get some evaporation of the fluid. on car engines it might be 6ml a year. I have some customers who are happy with a leak rate of 60ml an hour ! But that is with bigger pumps and much nastier chemicals.
Anti freeze is like oil in engine will chemically breakdown due to heat exposure. Reason to change to oil is it changes chemically from an alkali to an acid due to heat and particulates absorbsion.
So no system is air tight if you have pump in it!
I didn't assume that the thermostat as I assumed the engine was warmed up and at operating temp. As my experiance with vags is because the all have the same demister that doesn't work. By the time your wind screen is demisted the engine will be at operating temp. or you will be tryiung to drive the car through to very small apartures. thank god for quick clear screens made by Ford. Ford holds the patient and refuses to license it to anyone else!
I also worked at vag in engineering, we all know about the windows lifter but because so many cars share this part its a pita to do an engineering change on it.
Yes I have rebuilt the head on a car after it they got it to 110 degrees C I had to get the head re skimed. Angry driver and a loose cooling hose.
Also the 100 degree cut in wouldn't necessarly mean that the coolant going to head / block is 100 degrees c. the fan temp sensor is usually linked close to the radiator inlet as is how they are supplied to OEMS with radiator. there also temp sensor in the engine block cooling which is what you see on the dash guage. ( whiuch not technically true) As there is a guage damping algorythm written into ECU on how it output sensor reading to the dash. Which why fuel tank guage can give false readings.
Which something they found out on a car that I was working on basically it drained the tank faster that the guage could keep up with.
For the gas turbines I know jet engines pump the Jet fuel into the blade to cool them and heat the fuel up before being passed to the fuel injectors, or what I call a very large tap... Which they use silly putty and diamond shards/dust to polish. Also the blades are single crystal but this so they can cope with creep. Theres a bunch of other aerodynamic tricks they also use for cooling but i don't have the knowledge on that.
As say I am not a mechanic. I was just guessing based on what was stated, and what i assumed was a warmed up engine.
my keyboard is fecked missius spilt water on it so i= iu every time a press it.
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