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Old 29th May 2020, 16:51
  #7298 (permalink)  
Join Date: Nov 2004
Location: UK
Posts: 2
Originally Posted by Pontius Navigator View Post
Dead_pan, in our new car we were encouraged to switch air con to recirculation. It saves energy...
The compressor is still working pretty much as hard as with direct air. Any fractional difference to the typical load of around 2 kW which the aircon presents to the engine is hardly going to change anything. Turning the A/C off is the best way to make a small fuel saving.

Certainly, recirculation should remove most of the fresh incoming air, but not all; have you noticed how you can still clearly smell smoke when driving though it with recirculation set? I certainly have in every car I have tried to shut out smoke using recirculation. That means 'fresh' air is still getting in, albeit at a lower rate than on direct / fresh.
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