Boiling Temp of Disco 300Tdi

Well, assuming your cooling system is pressurised to 14.7 psi, (1 bar) the boiling point will be 100 degrees. For every 1 psi over what you have now, will raise the boiling point by 1 celcius.

Alistair

A little expansion of Alistair's explanation may help.

At a 'normal' atmospheric pressure of 14.7 psi, (1 bar), water will boil in the open at 100 deg C (If you live at 5000 ft the boiling point will be somewhat lower.)

Engines run with pressurised cooling systems - typically either 7, 13 or

15 psi higher than this 14.7 psi. Using Alistair's 1 degree for each 1 psi above normal atmospheric pressure, water in a 13 psi system will boil at about 113 deg C

Most cooling systems, however, are not filled with pure water but an antifreeze/water mixture. This itself has an elevated boiling point compared to pure water. A 50/50 ethylene glycol/water mixture boils at around 106 deg C at normal pressure and at around 125 deg C with a 13 psi overpressure.

This 125 deg C figure is probably what Stephen was looking for and comes with all the usual disclaimers as to its accuracy. Check the numbers yourself! The 300TDi, I think, normally runs with a 15 psi pressure cap so there is already a margin of safety in the numbers that I have quoted.

(There are many antifreeze manufacturers' sites on the internet which carry this sort of information. This is typical:

a search including boiling point, antifreeze and pressure)

I should probably add that the safest course of action is to assume a water only system fill. An alarm setting that assumes an antifreeze presence will not have gone off when a water only system has already boiled.

In message , Fanie writes

Many respected TDI engine remanufacturers put heat sensitive stickers on their engines. They will not honour under warranty anything that is taken over 95 degrees.