Entity George Goff spoke thus:

> I reason that the mass of coolant shunted to the engine through an open rear
> heater valve is being deprived of the greater heat loss it would suffer by
> being routed through that big heat exchanger up front

> anyone else noticed this subtle effect?
Yes! My diesel is running slightly hotter with (heater on
) since I insulated the heater hose!

And that's good . . .

-- Rachel
http://www.Spectrumology.com
AIM Gnarlodious