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| Radiator and condenser must be clean (clean them if necessary). |
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| The V-belt for air conditioner compressor and alternator is correctly tensioned. |
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| All air ducts, covers and seals are OK and properly installed. |
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| The flaps reach their end positions. |
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| The engine is at operating temperature. |
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| The evaporator and heating do not draw any uncooled air at highest fresh air blower speed. |
| With the engine running and the air conditioning system set to full power, check the following points: |
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| The fresh air blower is running |
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| The radiator fan is running or is switched on. |
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| The fresh air and air recirculation flap is set to „recirculate“. |
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| The ambient temperature is more than 15o C. |
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| The temperature switch for evaporator -E33- is correctly fitted and its switching temperatures are correct. |
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