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    3. why do my car revs increase when i switch on the windscreen demister?
    why do my car revs increase when i switch on the windscreen demister?

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    0  Views: 237 Answers: 1 Posted: 13 years ago
    Tags: motor query
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      1 Answer

      If the demister is part of the air-conditioning system, the engine has to work harder to power it. The same thing happens when it is working to cool the air entering the car. A/C systems consume a lot of power ( fuel) so only use them when essential

      13 years ago. Rating: 1
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