A. ContraSept Cleaning Procedure

A. ContraSept Cleaning Procedure:

Caution!
Wear safety glasses and respiratory protection when spraying cleaner.

^ Spray the evaporator in a 90° angle.

^ Move up and down, left and right to reach all areas of the evaporator

^ Do not rotate the probe to reach other areas of the evaporator. This will change the spraying angle and the cleaning effect will diminish.





Warning!
Do not exceed the manufacturer's recommended maximum air pressure as stated on the label affixed to the pressure cup (Figure 1b). Excessive air pressure could cause the canister to explode and potentially cause personal injury. The recommended pressure to clean the evaporator effectively is 120psi.

To reduce the possibility for this condition to reoccur, advise the owner to operate the blower at a higher speed, especially during humid conditions. For vehicles with a REST function, it also helps to use this feature during humid conditions when parking the car.

Additional Procedures - Model 203 / 209





1. Equipped with ACC climate system Option Code 580 - It is necessary to drill a 15mm hole in the climate housing to access the evaporator with the spray probe. The location for drilling the hole is described in WIS document AR83.30-P-5555-01A and Figure 1, A1 and B1.





2. A white foam block may be mounted to the housing between the blower motor and the main section of the case, see (Figure 2). On these housings, there is an alternate location of the hole as shown in Figure 1, A2 and B2.





Figure 3 - bend probe as shown

3. Bend the shorter of the two probes (Figure 3). Move the probe up and down as well as side to side to ensure the entire evaporator is sprayed with the cleaner. Plug hole after cleaning with seal plug A110 987 10 44 64.

4. Using the instructions below check the "REHEAT" setting. It should be set to "Anti-icing". Control Units --> Body --> EIS --> Control unit adaptations --> Read coding and change if necessary --> Climate control Standard setting: Climate control --> REHEAT mode --> Change From: "Standard" to: "Anti-icing protection"

5. In case of customer reports that the air conditioning system is emitting a musty/moldy odor from the vents within three months after using the Mercedes-Benz Contra Sept product as described above, a Biocide coated evaporator entered production as of VIN A731368 and F634900 (203) and F144091 and T042954 (209). In this case, this part can be installed in earlier vehicles. Be sure to thoroughly clean the inside of the heater box and make sure the drain tubes are not clogged before reassembling the system.

Additional Procedures - Model 211

1. Using the instructions below check the "REHEAT" setting. It should be set to "Fixed value". Control Units --> Air Conditioning --> C-AAC, AAC --> Control unit adaptations --> Read coding and change if necessary --> Workshop coding --> Evaporator-Control (REHEAT mode) --> Change From "Humidity-dependent (SERIES)" To: "Fixed value"

2. In case of customer reports that the air conditioning system is emitting a musty/moldy odor from the vents within three months after using the Mercedes-Benz Contra Sept product as described above, a new slanted heater box bottom which allows the condensation to drain better and a coated evaporator entered production as of VIN A675828 and X171590. In this case, these parts can be installed in earlier vehicles. Be sure to thoroughly clean the inside of the heater box and make sure the drain tubes are not clogged before reassembling the system.

Note:
Replacement of the heater box bottom and evaporator on the 211 and replacement of the evaporator on the 203 and 209 can only be claimed if the Mercedes-Benz Contra Sept treatment has already been performed. Dealers must claim which option was performed in the text of the claim.

Procedure for 164 and 251

Caution!
Wear safety glasses and respiratory protection when drilling hole and spraying cleaner.

1. Clean the evaporator with MercedesBenz Contra Sept as per WIS document AR83.30-P-5555T and the additional information in this document.

2. To clean the driver side of the evaporator, the spray probe is inserted into the hole for the evaporator temperature sensor as described in WIS document AR83.30-P-5555T, Step 4.1.

3. To clean the passenger side of the evaporator, the spray probe is inserted into a 15 mm hole that needs to be drilled in the climate housing as described in Steps 4 through 6.

4. Remove the cover below the instrument panel on the passenger side and fold carpet down. Refer to WIS document AR68.10-P-1520GZ (164) or AR68.10-P-1520RT (251).








5. Location of hole is shown in Figures 4 and 5. The hole should be centered in the triangular shaped section of the climate housing as shown in Figure 5.

6. Drill a 15mm hole in small increments using a mechanical drill stop to limit how far the drill bit penetrates the climate housing. A collar type drill stop, a piece of rubber hose or tape can be used as the drill stop.

Warning!
The drill bit cannot be allowed to penetrate the housing more than 13mm or damage to the evaporator could occur. When the drill bit breaks through the housing it has a tendency to pull inward. This is why a drill stop is necessary.

7. Bending of the probe may be required to be able to spray all parts of the evaporator. Move the probe up and down as well as side to side to ensure the entire evaporator is sprayed with the cleaner.

8. Follow the remainder of instructions in WIS document AR83.30-P-5555T. Reassemble vehicle in reverse order. Do not replace any filter back into the system!

Warning!
Do not exceed the manufacturer's recommended maximum air pressure as stated on the label affixed to the pressure cup (Figure 3). Excessive air pressure could cause the canister to explode and potentially cause personal injury.