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| Cooling fails completely. |
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| Cooling power is too weak regardless of vehicle speed or engine speed. |
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| Cooling is absent or insufficient after a few kilometres. |
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| The air conditioning compressor, the Air conditioning magnetic coupler -N25- or the Adjustment valve for the air conditioning compressor -N280- are switched off by the Low pressure switch for magnetic coupling -F73-, High pressure switch for magnetic coupling -F118-, Pressure switch for magnetic coupling -F129-or by the Air conditioning command and indicator unit / Climatronic -E87- or the Climatronic control unit -J255- in case of very high or very low pressure. |
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| There is no or little fresh air flow after travelling for a few kilometres (evaporator frozen). |
| In these cases, check the pressure values → Chapter. |
| In addition, the following problems may also occur: |
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| Tighten the fastening screws of the compressor and compressor support, using a Torque wrench - 5 to 50 Nm (enc. 1/2") -VAG 1331-. Refer to the specific repair manual for each vehicle → Heating, air conditioning; Rep. Gr.87. |
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| Check the refrigerant gas lines; they must not touch other assembly components and must be installed tension-free (adjust them if necessary). |
| Noise appears right after the air conditioning is turned on and/or on curves or when braking: |
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| Empty the refrigerant gas loop, remove air and fill it up again (excess of refrigerant gas in the loop) → Chapter. |
Note | An excess of refrigerant gas oil may also lead to this situation. |
| The air conditioning works perfectly, but water comes out of the bafflers (in the instrument panel or in the footwell): |
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| Check whether the evaporator water draining lines are correctly placed and that they are not pinched or bent. |
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| Check the water drainage valve, which must open and close correctly. |
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| Check the water box covering, which must not be damaged and should be properly installed (water must not enter the evaporator). |
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| Check the water drainage devices of the water box, which must not be closed (for example, obstructed by leaves). |
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