Quote:
Originally Posted by Frank Lee
I've been told it's not enough to matter. There will be a small amount of heat exchange but I'd wager it's peanuts, unless maybe in something like a Metro 3-banger that has a hard time heating up anyway.
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... or a 4-banger civic with aluminum block. With a complete grille block and the heater temp set to Cold, it takes all of my 11-mile commute to get up to temperature. It's 10-20 degrees colder if I have it set to heat, even with the fan off. Fan on, even colder.