A/C - HVAC - Foam Cleaner Information and Work Procedure
Date: March 2, 2012
Mercedes-Benz A220 2020 Page 74
Order No.: S-B-83.00/135
Group: 83
SUBJECT: MY-All, Models All
Mercedes-Benz HVAC-Foam Cleaner - Work Procedure
NOTE:
This procedure is not approved for vehicles covered under warranty. Refer to LI83.00-P-051588 for details on which vehicles can be cleaned under
warranty using Mercedes-Benz Contra Sept disinfectant cleaner (S-B-83.30/134). Additionally, the combination filter is a maintenance item and is
not covered under warranty.
Procedure
1. Start the engine with the A/C ON, temperature set to coldest setting, inlet set for outside air (not recirculate) and blower set for high speed.
Note:
The A/C must be run for at least 15 minutes to get condensation to build on the evaporator. This will adequately wet evaporator and promote the
product's ability to clean.
2. Locate the evaporator core case and blower assembly by removing any covers below the instrument panel on the passenger's side that may cover
the case.
3. Remove the cabin air filter and close off the empty filter cavity with the filter block off plate
^ For models where the filter bock off plate is integrated with the filter media (as with model 204/212). Remove the filter media, leaving the
bare block off plate, which can be reinstalled for the cleaning procedure (Figure 1).
4. On vehicles with an activated charcoal filter, remove these filters as well.
5. Drill a 3/16" hole in an accessible location between the evaporator core case & blower assembly, depending on your vehicle model. Use a drill
stop set at the thickness of the case to prevent plunging into case too deep.
Warning!
Follow the diagrams for a given vehicle model series, otherwise damage to the evaporator may occur.
^ Only drill through the case skin and gently probe inside with a dull instrument for any obstructions that the nozzle may encounter. If needed, use
the supplied plug and find another spot to drill.
Mercedes-Benz A220 2020 Page 75
6. Shake the disinfectant product can and with the hose attached to the can push the nozzle into position & rotate so the pointer faces the evaporator
core (Figure 2).
7. With the blower still on, start dispensing the foam in short bursts. As the case fills with foam, airflow will decrease from the vents. Pause for the
blower to push the foam through the core. (If the fan starts to squeak, stop dispensing while the blower catches up). As airflow resumes, continue
with short bursts of foam. If the system is overloaded by dispensing the foam too quickly, foam can escape from components under the dashboard.
NOTE:
Do not allow the foam to drip to any electronic components. Intercept any escaping foam with a towel.
To prevent possible staining, do not allow any foam to blow out of vents onto seating or other interior materials.
8. Continue with this application method until the can is empty then shut the system off completely.
9. After a minimum 10-minute wait, turn the blower on LOW to MEDIUM for 2 minutes to push excess foam out of the core.
10. Check that the drain is flowing freely under the vehicle. If there is no drainage, the drain is clogged. A clogged drain must be cleared.
Condensation will rinse out any remaining cleaner residue and contaminants.
11. Reinstall new cabin filters and activated charcoal (if equipped).
NOTE:
It is required that you replace the cabin filter after treatment. It is recommended that you replace the activated charcoal filters (if equipped).
Additional instructions for this procedure will be available via Learning & Performance:
VILT Course Code:X0001F-US.TTA (starting in second quarter 2012).
