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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
❑ In standard vehicle operation, the radiator fan is not activated by the Climatronic control module -J255- .
It will be displayed in the heater control head measured values block that the fan is not activated. Refer
to Vehicle diagnosis, testing and information system -VAS5051B- in the "Guided Fault Finding" function.
❑ The request to switch on the Coolant Fan -V7- is only transmitted by the Climatronic control module in
“Output Diagnostic Test Mode (DTM)“ via the databus system to the engine control module (ECM). Then,
with the engine running, the ECM activates the fan ( Coolant Fan -V7- and Coolant Fan 2 -V177- ) directly
or via the Coolant Fan Control Control Module -J293- . Check using Vehicle diagnosis, testing and in‐
formation system -VAS5051B- in the "Guided Fault Finding" function and ⇒ Engine Mechanical; Rep.
Gr. 19 ; Description .
❑ With engine running, the respective engine control modules switches, for example, the Coolant Fan and
Coolant Fan 2 (directly via the Coolant Fan Control Control Module) continuously to the desired output
(depending on engine type). Check using Vehicle diagnosis, testing and information system -VAS5051B-
in the "Guided Fault Finding" function and ⇒ Wiring diagrams, Troubleshooting & Component locations.
5 - Outside Air Temperature Sensor -G17-
❑ The measured value of the Outside Air Temperature Sensor is not used by the Climatronic control module
-J255- for controlling the heater. However, the measured value is used to calculate the permitted switch-
on time for the Heated Rear Window -Z1- .
❑ Measured value of Outside Air Temperature Sensor is evaluated by Instrument Cluster Control Module
-J285- and transmitted via Comfort CAN-Bus system to the Climatronic control module -J255- . Check
using Vehicle diagnosis, testing and information system -VAS5051B- in the "Guided Fault Finding" func‐
tion.
Removing and Installing
– Remove the bumper cover. Refer to ⇒ Body Exterior; Rep. Gr. 50 ; Removal and Installation .
– Disconnect connector on temperature sensor and unclip from mount in air duct
6 - Coolant Hose Connections To Heater Core
❑ Coolant hoses from connections to heater core, detaching and attaching, refer to
⇒ “5.14 Heater Core“, page 144 .
❑ Heat exchanger connection in engine coolant circuit, refer to⇒ Engine Mechanical; Rep. Gr. 19 ; Re‐
moval and Installation .
7 - Plenum Chamber Water Drains
❑ A water drain is installed at left and right in plenum chamber.
❑ Grommet, removing and installing, checking and cleaning, refer to
⇒ “4.10 Plenum Chamber Water Drain, Checking and Cleaning“, page 100 .
8 - Heated Rear Window -Z1-
❑ The command to heat the rear window is sent by the Climatronic control module -J255- via the Comfort
databus system. The vehicle electrical system control module -J519- controls the rear window defogger.
Refer to Vehicle diagnosis, testing and information system -VAS5051B- in the "Guided Fault Finding"
function and ⇒ Wiring diagrams, Troubleshooting & Component locations.
❑ Notes on function of heated rear window, refer to
⇒ “4.11 Rear Window Defogger, Checking “, page 101 .
❑ Rear window, removing and installing, refer to⇒ Body Exterior; Rep. Gr. 64 ; Removal and Installation
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
2. Description and Operation 5
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