Originally Posted by Vreimann
So far everything has been working pretty well without, but when it gets down below -10F it does seem to affect the heat somewhat. It could be me just needing more heat than what I am getting. I think TDIWyse was covering his grill and monitoring the coolant temps which is why I asked the question.
On gas vehicles I never did this because they run less efficiently and they had a lot of excess heat to share but I find that the diesel does not throw heat like our gas running BMW in the same temperatures.
This makes sense, especially if you can monitor actual coolant and oil temperatures, not just with the idiot light.