A/C - Musty/Moldy Odor Issues: Overview
Date: June 4, 2009Order No.: S-B-83.30/74p
Supersedes: S-B-83.30/74o dated April 29, 2009
Group: 83
Revision History
SUBJECT:
All Model 164, 171, 203, 204, 209, 211, 215, 216, 219, 220, 221, 230 and 251 Vehicles
Air Conditioning Musty/Moldy Odor Complaints
Under certain environmental conditions, typically in a hot and humid climate, the vehicle may emit a musty/moldy odor from the air conditioning system. This may be more noticeable when starting the vehicle due to residual condensation on the evaporator and on the interior surface of the heater box.
If you receive customer reports in the above model vehicles regarding a musty/moldy odor from the air conditioning system, the evaporator should be cleaned using Mercedes-Benz Contra Sept and the interior using the "ultrasonic atomizer", refer to WIS document AR83.30-P-5556A. For the best lasting results, follow the instructions provided below.
1. Remove all filters installed in the air conditioning system. The following filter may be fitted: Pollen filter, dust filer, combination filter or active charcoal filter.
2. Clean evaporator with Mercedes-Benz Contra Sept as per WIS document AR83.30-P-5555T.
Contra Sept is applied using a spray gun attached to a long probe. It is imperative to have as much of the evaporator sprayed with the cleaner by moving the probe in / out and up / down inside the case. It may be necessary to bend the probe in order to gain access. The cleaner is applied and allowed to dry. Refer to Figure 1a for spraying angle recommendation.
Note:
After cleaning the evaporator, a second treatment has to be conducted. After completion of section A (ContraSept), refer to section B (Wynns).
Parts Information
Note:
The following allowable labor operations should be used when submitting a warranty claim for this repair. This information has been generated on June 4, 2009. Please refer to Netstar --> Star TekInfo --> Star Time for the most current labor time allowance.
In Case of Warranty, use the table above.