5 Series E60 520d (N47) SAL
64 08 00 (645)
Mouldy smell from air conditioner
A mouldy smell can be detected inside the vehicle for a short time in either heating or air-
conditioning mode. This happens in particular immediately after the engine is started with
the air conditioner or automatic air conditioner switched on, or after switching the air
conditioner off during a journey.
The cause of this complaint is not a fault in the air conditioner or automatic air conditioner,
nor in the vehicle. The odour is caused by environmental influences during the air
conditioner's operation period.
The continuous condensation of air humidity on the evaporator when the air conditioner or
automatic air conditioner is operated over a lengthy period creates an ideal habitat for
bacteria and other micro-organisms.
Together with impurities brought in from the outside air, these can cause microbes to grow
on the evaporator, resulting in a mouldy smell.
By changing the microfilter regularly, the entry of impurities can be minimised and
occurrences of the above-mentioned issues can be delayed and/or prevented.
Replacing the evaporator does not produce a lasting result as microbes are still able to
All model series with air conditioner (IHKR) or automatic air conditioner (IHKA)
1. Cleaning with the "Aircomatic" evaporator cleaning unit
In case of customer complaint, clean the evaporator with the "Aircomatic" cleaning unit
supplied by the company WYNN'S. The "Airco-Clean" cleaning agent from the same
company is required for this process.
WYNN'S calls this cleaning process the "ultrasonic method."
The "Seku-Aircond" cleaning agent for the spray unit may not be used for this
Description of the working steps:
Remove the microfilter (after cleaning the unit, replace it with a new filter).
Start the vehicle.
Switch off the air conditioner.
Set the temperature control to minimum.
For automatic air-conditioning systems (IHKA): Switch off the automatic air
SI Mouldy smell from air conditioner All series
BMW AG - TIS
Issue status (12/2007) Valid only until next DVD is issued
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