Evaporator In Heater And A/C Unit, Cleaning With The Ultrasound A/C Cleaner

Special tools and workshop equipment required 

• Ultrasound A/C Cleaner (for example the Ultrasound A/C Cleaner :VAS6189B  ). Refer to the Parts Information for the cleaning device currently available.
• Ultrasound A/C Cleaner - Airco-Clean Fluid :VAS6189/1  . Refer to the Parts Information.

On a vehicle without an A/C system (only with a heater) the evaporator installed in the heater does not function, it is only works a place holder and to reduce noise. If there are odors in the evaporator, it can be cleaned in the same way as an A/C system.

Preliminary work

-- Check by switching from fresh air to recirculating air mode to see whether the odor is actually originating from the front heater and A/C unit evaporator.

• The odor can only be fixed by cleaning with the ultrasonic HVAC cleaning system if it originates in the evaporator.

-- Check the plenum chamber and the plenum chamber water drain and clean them if necessary. Refer to PLENUM CHAMBER WATER DRAIN, CHECKING .

-- Remove the dust and pollen filter and check for odors and dirt. Refer to DUST AND POLLEN FILTER, REMOVING AND INSTALLING .

-- Clean the installation slot of the front heater and A/C unit dust and pollen filter (remove leaves, dust and other contaminants). Refer to DUST AND POLLEN FILTER, REMOVING AND INSTALLING .

• On this vehicle, the dust and pollen filter is installed before the Fresh Air Blower -V2-, therefore it must not be removed when cleaning the evaporator.

-- Reseal the dust and pollen filter cover on the heater and A/C unit.

-- Start the engine.

-- Set the A/C system to "recirculating air mode" and switch off the A/C compressor (the indicator lamp in the A/C  or A/C MAX  button do not turn on).

-- Open the instrument panel vents and, if equipped, the vents in the rear center console.

-- Close the windows and sunroof.

-- Set the lowest possible temperature "cold" temperature setting) for all zones of the A/C system.

-- Adjust to the lowest fresh air blower setting on the Front A/C Display Control Head -E87- and select the airflow direction on the "instrument panel vent" (the vent in the rear center console).

-- On the Front A/C Display Control Head -E87-, select the air flow direction to the "instrument panel vents".

Cleaning

-- Fill the ultrasound A/C cleaner with the Ultrasound A/C Cleaner - Airco-Clean Fluid :VAS6189/1  (note the operating manual).

-- Place the ultrasound A/C cleaner (for example, the Ultrasound A/C Cleaner :VAS6189A  ) in the front passenger footwell.

-- Start the ultrasound A/C cleaner (for example the Ultrasound A/C Cleaner :VAS6189A  ) according to the operating instructions and route the outlet hose belonging to it so that vapor escaping via the heater and A/C unit recirculation opening (behind the glove compartment near the right wheel housing) is drawn in by the Fresh Air Blower -V2-.

-- Close the vehicle doors.

• The cleaning process takes about 15 to 20 minutes. It is complete when vapor no longer comes out of outlet hose.

Final Procedures

-- Turn off the ultrasound A/C cleaner (for example the Ultrasound A/C Cleaner :VAS6189A  ).

-- Open the vehicle doors and air out the passenger compartment for at least 10 minutes.

-- Remove the ultrasound A/C cleaner (for example the Ultrasound A/C Cleaner :VAS6189B  ) from vehicle and clean it according to operating instructions.

-- Switch off the ignition.

-- Install the dust and pollen filter. Refer to DUST AND POLLEN FILTER, REMOVING AND INSTALLING .