| Requirements for achieving maximum heating potential |
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| All air ducts, covers and seals in good condition and properly fitted |
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| The air flow through the dust and pollen filter is not obstructed by dirt |
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| The Bowden cable and the levers for the operation of the temperature flaps are in good condition |
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| The liquid coolant thermostat must be in good condition |
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| The sponge material joint in the heat exchanger in the heating must be in good condition → Chapter |
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| For diesel engine vehicles the operation of the additional heating and the activation of the Heating control unit -J65- must function correctly → Chapter |
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