From another forum , seems plenty more on same subject .
Ford Focus 1.8 2009 plate - AC coming on when selecting windscreen heater - elekie&a/c doctor
Standard function of all Fords with a/c,and most other current cars these days.Designed to improve demisting and dehumidifying air directed to windscreen.hth
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Sat 11 Jun 2011 08:55Back Top End
Ford Focus 1.8 2009 plate - AC coming on when selecting windscreen heater - injection doc
Normal if its fitted with climate control
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Sat 11 Jun 2011 10:12Back Top End
Ford Focus 1.8 2009 plate - AC coming on when selecting windscreen heater - FP
"I can't think its normal for air conditioning to come on when heater is blowing."
As others have said, it's not the cooling function that's important here, it's the de-humidifying and it can make a lot of difference to the speed at which a misted-up screen will clear. You can always switch it off when it's done the job.
Many cars with a/c have had this automatic setting for years.
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Sat 11 Jun 2011 16:42Back Top End
Ford Focus 1.8 2009 plate - AC coming on when selecting windscreen heater - Peter.N.
I would concur, the dry air coming from the evaporator will clear the screen very much more quickly than hot air alone, especially in humid conditions.
Posted Dec 2, 2015 (8 years ago)