Note! | For all complaints marked with a * → Chapter. |
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| The cooling has failed completely.* |
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| Insufficient cooling at all vehicle speeds and engine speeds.* |
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| No cooling or insufficient cooling after driving some distance.* |
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| The A/C compressor, the air conditioning system magnetic coupling -N25- or the A/C compressor regulating valve, air conditioning system -N280- have been switched off by low pressure switch for magnetic coupling -F73-, high pressure switch for magnetic coupling -F118-, air conditioning system pressure switch -F129- or by operating and display unit for Climatronic air conditioning system -E87- or Climatronic control unit -J255- because pressure was too high or too low.* |
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| No fresh air flow, or very much reduced fresh air flow after driving some distance (evaporator iced up).* |
| In addition the following complaints may also arise: |
| The air conditioner compressor is noisy |
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| Tighten the securing screws for the air conditioner compressor and the air conditioner compressor bracket using a torque wrench. |
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| Check routing of refrigerant pipes and hoses; they must not touch other components and must be installed without tension (adjust if necessary). |
| Noises (refrigerant hammering) occur immediately after the air conditioning is switched on and/or in a curve or when the brakes are applied: |
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| Discharge refrigerant circuit, evacuate and charge again (too much refrigerant in circuit). |
Note! | Excess refrigerant oil in the circuit may also cause this problem (e.g. if the refrigerant oil level was not checked after the air conditioner compressor was renewed). |
| Water sprays out of the air vents (dash panel or footwell) although the air conditioning system otherwise works properly: |
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| Check that the condensation water drain is properly routed; it must not be crushed or kinked. |
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| The condensed water drain valve must not be hindered in its operation by wax or underbody sealant and must open and close properly. |
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| Check the plenum chamber cover; it must be undamaged and be installed correctly (no water must flow into the evaporator). |
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| Check water drains in plenum chamber; they must not be blocked (e.g. by leaves). |
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