[mark christopher]

Originally Posted by smokes

diesel always run cooler than petrol any hotter than 80 degrees will eventually cause the head to warp or lead to gasket failures. You could always put some cardboard in front of the radiuator like london taxi cab drivers do in the winter. not reccomended though. If you didn't have any anti freeze you would have siezed the water pump or cracked the block.

If the temperature is dropping it is probably cause there is snow between the bonnet and the windscreen. Which is where the air intake is for fresh air to the interior. but you should top up the coolant once a year as the gylcol(anti freeze) will evaporate off over time.

Originally Posted by smokes

It dumped the coolant and i was going by the temperature driver said for the warped head.

Direct Injection Diesels run at 87 degree Celcius and indirect run about 80 degrees.

Hotter or Colder the engine runs away from the ideal temp of the type engine and fuel the worse the fuel mix burns. cuase in detonation if too hot, and incomplete burn if to cold.

I had 3 new leons 2 cupras and 1 tdi the PQ 35 platform demister is really slow and rubbish when thermostat open the temp would drop for few minutes on them at -4 to - 10 degrees in winter it usually took 10 minutes to defrost the cars due the demister. That was on the new cars thats why I said what I said

Vag build quality was a bit of an issue due to the volume parts the use in production of the platforms..... I think they have got on top of it now....

so your saying the car dumped its coolant and the customer saw 110 degree, and you believed him? your a bigger fool than i thought! heads dont warp at 110 our engines will run at 110 at speed and load for ages. no problems.

now i was going to quit while im ahead but you just stuck your foot in it again.
after claiming a head will warp and blow gaskets at 80 deg, your now saying they run at 87, i hope you dont change your mind that much when your designing your far more complex systems!

as for you comment on fuel and detonation, the systems ford use detect knock and fuel acordingly to prevent it and get max efficiency and combustion, same engine as citroen and pugeot