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Message: <blockquote data-quote="rot" data-source="post: 24318528" data-attributes="member: 83847">Usually AC compressor will run at the same speed no matter what AC setting your are on. It's directly coupled to some engine belt and will engage when you turn the AC on. (both fan and cool).I think it's different on electric/hybrid cars.What this temperature control does is it mix hot air from the engine with cold air from AC to adjust the temperature (not exhaust gas of cause). So I don't think we can control the fuel consumption using AC controls. However you can just run with the fan on but cooling off, that will save some fuel and will not get any dusty air inside the car as it comes through the cabin filter.<a href="https://www.youtube.com/watch?v=04MlTepEIz4" target="_blank">https://www.youtube.com/watch?v=04MlTepEIz4</a></blockquote>

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