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Originally Posted by QuestionMark
Perhaps I'm being dumb, but aren't heating and cooling the same, just relative to the ambient temperature? Because there isn't any heating or cooling button to select, only the temperature scale.
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It's more complicated than that, and no-one has succeeded in trying to work out exactly how the decisions are made in 'Auto' mode. If I were you I would carry out the checks suggested to see if you can find a fault with your blower (ventilation fan) control.
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So in 10 degrees ambient temperature every setting will effectively be heating, whereas in 30 degrees every setting will be cooling?
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Not necessarily. It also depends upon the interior temperature of the car and there are also sensors on the heater matrix and air conditioning evaporator I seem to remember.
Simon