HDi Running Temperature

[Ruan]

That's precisely how it makes it into the coolant, rather that being in the cylinder and the excess air in the cylinder absorbing the heat, the slow burning diesel which is then making carbon and carbon monoxide as it's not got enough oxygen goes out the exhaust ports, which means going through the cylinder head, which is aluminium and will absorb the heat straight into the cooling system... That's where the problem lies...

A diesel billowing coal will increase egts and coolant temps like nothing else..