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It seems to be that forcing the air over, rather than through the engine bay means you get less cooling done at the Radiator.
consequently, the temerature gradient from "in at the top" to "out at the bottom" is lower, and you lose less heat from the block to the coolant (to get it back "upto temp" for going to the rad.
Warmup is mainly affected becasues you stop the colder air entering the engine bay and keeping the engine block cold.
as far as Ic an see.
that reminds me, better price up a thermostat!
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US MPG for my Renault Clio 182
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