Condensation Water Drain Hose, Checking
There are different versions of the condensation water drain hose. On the version -A-, it is engaged in the floor panel -2- by three retaining tabs -1-. On the version -B-, it is engaged in the floor panel -2- by the tab -3 and 4-. Make sure that the condensation water drain is seated correctly and securely in the floor panel.
Procedure
-- Remove the center console. Refer to CENTER CONSOLE, REMOVING AND INSTALLING .
Danger of the airbag control module malfunctioning due to corrosion on the connector.
- Cover or seal the connector for the airbag control module to protect it from moisture.
-- Cover the airbag control module -3-.
-- Carefully fold back the carpet near the condensation water drain hose far enough so that the condensation water drain hose is visible.
-- The retaining tabs -arrows- on the condensation water drain hose must be engaged completely and with pretension in the floor panel opening in the body -1- (this illustration shows version "A").
- The sealing lip must not sit loosely on the body opening.
- The retaining tabs -1- (on the version -A-) or -4- (on the version -B-) must be engaged completely.
- If the pretension is inadequate, seal the connection point between the body and the bracket with silicone adhesive, for example.
-- Check the condensation water drain -3- for a secure fit on the heater and A/C unit connection -1-.
- The condensation water drain -3- must not sit loosely on the connection for the heater and A/C unit -1- (condensation water can escape with a loose fit).
- If the pretension is inadequate, secure the condensation water drain -3- on the connection for the heater and A/C unit -1- with a cable tie or a hose clamp.
-- If the bracket with the condensation water drain hose sits correctly in the body opening and on the connection for the heater and A/C unit, the condensation water drain hose must be checked for dirt.
-- Remove the condensation water drain hose. Refer to CONDENSATION WATER DRAIN HOSE, REMOVING AND INSTALLING .
-- Check the distance between the condensation water drain opening -1- and the heat shield -3-.
- There must be a sufficient distance (dimension -x-) so that the condensation water can drain from the condensation water drain hose -2-.
-- Check the A/C condenser water drain for dirt and if necessary, clean using a piece of wire.
- The cross section of the condensation water drain hose must not be constricted (pressed together).
If there is a complaint regarding moisture in the vehicle interior, check the following components in addition to the condensation water drain:
- Water drain for the plenum chamber. Refer to PLENUM CHAMBER WATER DRAIN, CHECKING .
- Rain water drain channel for damage and correct installation. Refer to RAIN WATER DRAIN CHANNEL, REMOVING AND INSTALLING .
- Plenum chamber cover for damage and correct installation. Refer to OVERVIEW - PLENUM CHAMBER COVER
- Dust and pollen filter for contamination and correct installation. Refer to DUST AND POLLEN FILTER, REMOVING AND INSTALLING .
- Forced air extraction in the luggage compartment. Refer to VEHICLE INTERIOR FORCED AIR EXTRACTION, CHECKING .
- Activation and function of the air recirculation door (for example, in the "output diagnostic test mode") using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
If there are complaints of moisture in the vehicle interior, also check the vent temperature of the air from the evaporator, which only occurs when the A/C compressor is switched on under certain ambient conditions. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.
- "Read the measured value" for the Evaporator Vent Temperature Sensor -G263-.
-- Check the air vent temperature at the evaporator under the operating conditions described by the customer or at the following setting on the control heads:
Vehicles with Manual Climate Control System:
-- Adjust the following settings on the A/C system control heads:
This illustration shows the layout of the regulators -1, 2 and 3- and the buttons -4 and 5- on a left-hand drive vehicle. The layout may be different on right-hand drive vehicles.
- A/C compressor on: The indicator lamp in the A/C button (in regulator -2-) illuminates.
- Turn the regulator -2- (Front A/C Display Control Head 3 -E776-) for the temperature setting to the "cold" stop.
- Fresh air mode on: The indicator lamp in the Fresh Air and Recirculating Air Mode Button -E781- -4- does not come on.
- Turn the fresh air blower regulator -1- (Front A/C Display Control Head 2 -E775-) to the lowest possible speed (the fresh air blower can still be heard running).
- Turn the regulator -3- (Front A/C Display Control Head 4 -E777-) for air distribution to "instrument panel vent".
Vehicles with Automatic Climate Control System:
-- Adjust the following settings on the A/C system control heads:
This illustration shows the layout of the regulators -1, 2 and 3- and the buttons -4 and 5- on a left-hand drive vehicle. The layout may be different on right-hand drive vehicles.
The information in the regulators -1, 2 and 3- is only displayed when the ignition is switched on and goes out when the ignition is switched off.
- A/C compressor on: The indicator lamp in the A/C button (in regulator -1-) illuminates.
- "Auto" mode on: The indicator lamp in the Auto button (in the regulator -2-) illuminates.
- Turn the regulator -2- (Front A/C Display Control Head 3 -E776-) for the temperature setting to the "cold" stop.
- Turn the regulator -3- (Front A/C Display Control Head 4 -E777-) for air distribution to "instrument panel vent".
- Fresh air mode on: The indicator lamp for "recirculating air mode" in the Recirculation button (in the regulator -3-) does not come on.
- Turn the fresh air blower regulator -1- (Front A/C Display Control Head 2 -E775-) to the lowest possible speed (setting 1, the fresh air blower can still be heard running).
- Defrost mode off: The indicator lamp in the Defrost Button -E782- -4- does not come on.
Continuation for All Vehicles:
-- Open the instrument panel vents.
-- If the Evaporator Vent Temperature Sensor -G263- measured value is too low (colder than 0 °C (32 °F) for a long period of time when the ambient temperature is above 0 °C (32 °F)) or too high (even though the A/C is working correctly, for example: higher than 10 °C (50 °F)), follow the procedure for checking the cooling output. Refer to COOLING OUTPUT, CHECKING .