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Message: <blockquote data-quote="hrm" data-source="post: 24319277" data-attributes="member: 88125">Most newer cars do what you say and normally don't have a clutch to engage/disengage compressor. Even Japanese cars like Vitz, Axio, allion/Premios have this type of compressors known as variable displacement compressors. They run constantly when engine is on and ECU adjusts compressor speed based on various factors. When interior is cooled to desired level compressor runs very slowly just to maintain the cool with less load to the engine. With these cars having AC turned on or off(or having different temps set) doesn't affect fuel economy or acceleration that much.But cars with regular clutch based compressors it's a different story and compressor doesn't run all the time. Clutch will engage/disengage compressor based on temp sensors against set temperature or cooling level. And compressor always have a fixed speed and load to the engine doesn't change like VDCs do. So when it is run it adds weight to the engine and affect fuel economy to some extent. (Depending on car model, engine displacement etc)</blockquote>

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