A8L Quattro Sedan V8-4.2L (BVJ) (2007)
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Hose/Line HVAC: Description and Operation
Condensate Drain Hose
‹› This vehicle is equipped with 2 condensate drains left and right at air conditioner or center tunnel.
‹› There is no door at valve for condensation water drain - C -.
‹› For complaints of moisture in passenger compartment, check the following components as well as condensation water drains:
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water drain for plenum chamber. Refer to=> [ Checking and Cleaning Plenum Chamber Water Drain ] See: Heating and Air
Conditioning/Description and Operation/Checking and Cleaning Plenum Chamber Water Drain
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the plenum chamber cover for correct installation. Refer to=> [ Dust and Pollen Filter ] See: Heating and Air Conditioning/Description and
Operation/Air Distributor Housing
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the dust and pollen filter for dirt and its cover for correct installation. Refer to => [ Dust and Pollen Filter ] See: Heating and Air
Conditioning/Description and Operation/Air Distributor Housing
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forced air extraction vents in luggage compartment. Refer to=> [ Vent Frame, Checking ] See: Body and Frame/Seats/Seat Fan/Testing and
Inspection/Vent Frame, Checking
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the function of the back pressure flap. Refer to=> [ Air Intake Shroud with Air Flow Door ] and the recirculation flap, refer to=> [ Recirculation
Door Motor ] , for example with the "output diagnostic test mode" function vehicle diagnosis, testing and information system VAS 5051 in the
"Guided Fault Finding" function.
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the measured values and function of the Air Quality Sensor (G355) at the Climatronic Control Module (J255) front A/C control head vehicle
diagnosis, testing and information system VAS 5051 in the "Guided Fault Finding" function.
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the signal for detecting windshield wiper operation at the Climatronic Control Module (J255) front A/C control head vehicle diagnosis, testing and
information system VAS 5051 in the "Guided Fault Finding" function.
‹› Check the output temperature of the air from the evaporator using the measure values for the Evaporator Vent Temperature Sensor (G263) under
the conditions described by the customer with the following settings on the Climatronic Control Module (J255) A/C control head vehicle
diagnosis, testing and information system VAS 5051 in the "Guided Fault Finding" function.
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Driver and passenger temperature set to "LO".
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Intermediate fresh air blower speed approximately 7 volts vehicle diagnosis, testing and information system VAS 5051 in the "Guided Fault
Finding" function.
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"Fresh air mode" for the A/C system
‹› If measured value of sensor is too low at an ambient temperature above 0 °C, colder than 0 °C for extended period of time or too high greater than
10 °C even though A/C system is operating without problems, observe notes for testing cooling output. Refer to => [ Cooling Output, Checking ]
See: Heating and Air Conditioning/Testing and Inspection/Component Tests and General Diagnostics/Cooling Output, Checking
