Testing and Inspection for Evaporator Drain Tube
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Evaporator Drain Tube: Testing and Inspection
Evaporator Housing Drain, Checking
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Check routing of evaporator hose; it must not be twisted or crushed.
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Remove evaporator valve and evaporator hose
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In area of hole - E - check gap between noise insulation mat and floor panel (noise insulation mat must not make contact with installed evaporator
valve).
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Check evaporator valve - C - ; it must not be gummed up with wax or underseal.
NOTE: There is no flap at the evaporator valve - C -. The flap function is assumed by a coil formed by the valve.
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Check for contamination of evaporator hose - B - (pay attention to oval cross-section of hose - D - ) and clean if necessary.
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Use a piece of wire to check for contamination of evaporator of air conditioner - F - and clean if necessary.
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In the event of moisture in the passenger compartment:
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Check passenger compartment forced air extraction (via luggage compartment), See: Cabin Ventilation Duct/Testing and Inspection
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Check signal for recognition of wiper operation at operating and display module, Climatronic Control Module J255.
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Check dust and pollen filter for contamination and corresponding cover for correct installation.
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Check the various control motors and the corresponding levers. Pay particular attention to position of Air Flow Flap Motor V71 and Recirculation
Flap Motor V113 as well as the relevant flaps.
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Check measured value of Evaporator Vent Temperature Sensor G263, See: Testing and Inspection/Scan Tool Testing and Procedures (Reading
measuring value block, display group "010" ).
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If the sensor measured value is too low under the usage conditions described by the customer (colder than 0 degree C for lengthy period at
ambient temperature above 0 degree C), pay attention to notes on checking cooling output.
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If the measured value of the Evaporator Vent Temperature Sensor G263 is too high under the usage conditions described by the customer (greater
than e.g. 10 degrees C although air conditioner is functioning properly), check the Evaporator Vent Temperature Sensor G263 (incorrect
measured value can cause evaporator to ice up).
