IMO the BMW comment that a different (higher temp) stat will not achieve anything is contrary to observation. There are lots of people around the forum who had cool running diesels which were transformed (temp and MPG-wise) by renewing the stat. That in itself is disproves to the comment. I would also argue that the engine yields insufficient heat to raise the temp much higher. For example. if you were to restrict the flow through the thermostat, or even blank it off, do you think the engine would reach 100C and more? Try it and find out. I think the apparently redundant radiator fan would be woken up!
It may well be so that the cooling system in the diesel is simply too effective. There's a rather large volume of coolant circulating in a large cooling system. Maybe the use of a smaller radiator would be a better approach than partially blanking off the standard one?
TC
|