| Possible cause of odour formation |
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| Generally occurs in the engine compartment due to leakage at the engine or gearbox |
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| Sulphur-like smell of exhaust gas |
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| Caused by leakage at the exhaust system |
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| Caused by exhaust gas ingressing into the passenger compartment e.g. on reversing (on driving through a cloud of exhaust fumes). |
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| Caused by leakage at engine cooling system or air conditioner heat exchanger |
Note | If the fishy smell varies with the set temperature (less noticeable in „Lo“ temperature setting / „cold“ setting than in „Hi“ temperature setting / „warm“ setting), check the heat exchanger of the air conditioning unit for leaks (no constant flow of air through the heat exchanger). |
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| Odour given off by floor coverings, retrofitted loose seat covers etc. |
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| Mouldy smell from plenum chamber |
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| Caused by accumulation and deposits of foreign matter such as leaves, pine needles etc. |
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| Caused by water not able to drain out of the plenum chamber. |
Note | Check the plenum chamber water drains → Chapter. |
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| Odour from air conditioning unit |
Note | t
| Odours occurring in the air conditioning unit are usually perceptible in both fresh-air and air recirculation mode. If an odour nuisance only occurs in fresh air mode or only in air recirculation mode, the air conditioning unit is not normally the cause of the problem. |
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| If a heat exchanger is leaking, the smell of escaping coolant generally varies with the temperature set. In „Lo“ temperature setting / „cold“ setting, there is no flow of air through the heat exchanger and the odour is less perceptible. |
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| Caused by too much condensate in the air conditioning unit |
Note | –
| Caused by old or severely contaminated dust and pollen filter. |
Note | –
| Caused by deposits on evaporator fins |
Note | Clean the evaporator with the ultrasonic A/C cleaner -VAS 6189- → Chapter. |
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