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Well thanks, folks,for all the explanations and videos (and thanks to those who don't condescend in their explanations). I do, in fact, understand simple physics and I have at least a basic understanding of negative-feeback control systems and how they operate.
I have 'jimmied' up a quick grille block on my Forester and we'll see if it actually reaches operating temperature quicker than without the block. My original suspicion was that it would have to be VERY, VERY cold before a grill block would impact engine warmup times but now I have my doubts. I have a very good idea of how long (and where in my commute) the engine finally reaches op temp without any block so I can do a decent quick compare. If I think there's any difference I may do some more rigorous A/B/A testing for my own edification. I anticipate startup temp tomorrow morning of about 39 Deg F (so not that cold compared to what Mr Vekke contends with in Finland!).
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