Condensation Water Drain, Checking
This vehicle is equipped with two condensation water drains (left and right on the A/C unit or center tunnel).
The end -C- of the condensation water drain hose -B- does not have a valve or a door. The condensation water flows out over the rubber seals.
There are different versions of the condensation water drain hoses -B-. On version "1" (see illustration (Fig 1)), the condensation water drain -B- is inserted directly in the opening -D-. On version "2", the condensation water drain -B- is inserted into the bracket -A-. The bracket -A- is held in the opening -D- in the floor panel -C- by tabs on the bracket -A-. After installing the bracket -A-, the condensation water drain -B- must be pushed with pretension into the floor panel -C- to prevent any condensation water coming out of the drain -B- into the passenger compartment. Seal the area between both parts with silicone adhesive D176 001 A3.
For complaints of moisture in passenger compartment, check the following as well as condensation water drain:
-- Plenum chamber water drains. Refer to PLENUM CHAMBER WATER DRAIN, CHECKING .
-- Check the cowl panel trim and the fresh air intake housing for proper installation and damage. Refer to FRESH AIR INTAKE, REMOVING AND INSTALLING .
-- the dust and pollen filter for soiling and correct installation. Refer to DUST AND POLLEN FILTER, REMOVING AND INSTALLING .
-- Forced air extraction vents in luggage compartment. Refer to PASSENGER COMPARTMENT FORCED AIR EXTRACTION, CHECKING .
-- Back pressure door/fresh air door activation and function (refer to Airflow Door Motor -V71-, REMOVING AND INSTALLING ) and air recirculation door (refer to Recirculation Door Motor -V113-, REMOVING AND INSTALLING ) for example, via the "output diagnostic test mode" of the Guided Fault Finding using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
- If there are complaints regarding humidity in the passenger compartment which only appears when the A/C compressor is switched on and under certain climatic conditions, check the temperature of the air coming out of the vents from the evaporator as follows:
-- Select "read measured values block" for Guided Fault Finding (using the measured value from the Evaporator Vent Temperature Sensor -G263-) using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
-- Check the output temperature of air at evaporator under conditions reported by the customer or at the following setting on the Climatronic Control Module -J255- A/C display control head, "Auto" operating mode, A/C compressor switched on (indicator lamp in the AC or A/C button lights up), temperature setting "Cold", middle fresh air blower speed at a voltage of approximately 7 V on the Fresh Air Blower -V2-, fresh air mode (indicator lamp "Recirculation" button does not light up) and open instrument panel vents, the air vent temperature at the evaporator.
-- The sensor measured value is too low (at an ambient temperature above 0 °C (32 °F), longer time colder than 0 °C (32 °F)) or too high Even though the A/C system is working correctly, above, for example, 10 °C (50 °F). Correct the cause of the difference and note the information for the cooling output test. Refer to COOLING OUTPUT, CHECKING .