Quote:
Originally Posted by Frank Lee
"Even having the temp set to heat, without any fan, will take some heat from the cooling system."
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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Absolutely it matters. The engine sucks fuel much faster when warming up, due to the richer mixture. Putting heat thru the heat exchanger will make the warmup take longer because that heat's not going to the block to warm it. So your mpg will be less than optimum the whole extra time it takes to achieve warmup. Regardless of what you do with the fan.
Lots of stuff matters now - stuff that didn't matter back when gas was $0.75 or $0.35/gallon. I can remember those days!