botach wrote:
I'd think in really cold weather, in a diesel car you'd find that with heater on any more than first notch, then engine temp would drop when stationary.Even when my engine temperature has been normal for some time ,on my car ( only 85k on clock) ,the temperature will drop in winter if stopped with heater on high .
Not just my car. I used to do a lot of night standby before retiring. We went to site, got back in van and got comfy. Standard procedure was to go for a run to warm up engine and sit with engine running and heater on low till called/job stopped. On really cold nights, we might have to move off for a quick warm up run.
Look closely at the big trucks on ICE ROAD TRUCKERS ,all diesel powered, and you'll notice they all have radiator covers.
Yup. Not all diesels but the more recent ones (after about "Euro 4" emissions levels).
Back in the early 1980s I can remember being a spotty-faced engineering undergraduate and having a visiting lecturer in thermodynamics come and teach us about diesels. He told us just how spectacularly inefficient the internal combustion engine was, but how things were slowly improving. I can remember one of the brighter students sticking up their hand and asking if he ever thought the engines would get SO efficient that manufacturers would struggle to get enough waste heat from the cooling system to power the heater? He just laughed...
And here we are, 30-odd years later, with PRECISELY that problem! If you sit there in neutral at about 2000 revs, most of them will just about make enough heat to keep you toasty!