Condensation Drain, Checking

Condensation Drain, Checking

- Check the routing of the condensation water drain hose. It must not be twisted or crushed.

- Remove the condensation water drain valve and the condensation water drain hose. Refer to => [ Condensation Drain ] A/C System Control and Regulation Components

- Check the distance of the noise insulation mat in the area of bore - E - from the floor plate (the noise insulation mat must not touch the installed condensation water drain valve).





- Check the condensation water drain valve - C -. It must not be obstructed by wax or underbody sealant.

• No flap is present at condensation water drain valve - C -. The function of the flap is assumed by a spiral formed by the valve.

- Check condensation water hose - B - for soiling (pay attention to the oval cross section of hose - D -) and clean it as necessary.

- Use a wire, for example, to check the condensation water drain of A/C unit - F - for soiling and clean if necessary.

• In the event of moisture in the passenger compartment:

- Check air extraction outlets in passenger compartment (via luggage compartment). Refer to => [ Vent Frame, Checking ].

- Check the signal for recognition of wiper operation at the Climatronic control module (J255) A/C control head. Refer to => [ Display Group 018 ] Measured Value Blocks for Display Groups 011 Through 019

- Check the dust and pollen filter for soiling and the associated cover for correct installation. Refer to => [ Dust and Pollen Filter ] A/C System Control and Regulation Components

- Check the various control motors and the associated levers. Pay special attention to the position of the back pressure flap motor (V71) and the recirculation flap motor ( V113) and the corresponding flaps.

- Check the measured value of the evaporator vent temperature sensor (G263) (read the measured value block, display group " 010").

- If the measured value of the sensor is too low under the operating conditions reported by the customer (at an ambient temperature above 0°C, colder than 0°C for a long period of time), observe the information regarding testing of the cooling output. Refer to => [ A/C Unit, Checking Cooling Output ] A/C Unit, Checking Cooling Output.

- If the measured value of the evaporator vent temperature sensor (G263) is too high under the operating conditions reported by the customer (even though the A/C system is operating without difficulty at greater than e.g. 10°C), check the evaporator vent temperature sensor (G263) (incorrect measured value may cause evaporator to ice up).