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3.2
Temperature Door and Heater Output
Activation, Checking
Note
♦
On Audi TT without A/C (just heating), only one temperature
door motor is installed. Both temperature doors for the left and
right sides are connected in the heater air distributor housing
via a shaft and moved together by the Left Temperature door
Motor -V158- . Refer to
⇒ “4.1 Heater Electrical Attachments“, page 18
.
♦
Vehicles without A/C do not have a temperature sensor. The
outflow temperature is not controlled. The Left Temperature
Door Motor -V158- is placed in a position calculated according
to the temperature setting on the temperature rotary switch
-A- and the programmed motor stop values by the Climatronic
control module -J255- .
♦ If coolant circuit is not completely bled after filling, air may ac‐
cumulate in heater core of heater, thus reducing heating per‐
formance, additional noises may occur or customer may
complain of different air temperatures flowing out of vents at
driver's side and front passenger's side.
Corrective action:
– Perform long road test at increased engine speed (at least 10
minutes, engine speed greater than 2500 RPM). Select a low
gear during the test to prevent excessive vehicle speed.
– If customer complains of poor heating performance at specific
engine speeds, check incorporation of heater core of heater
in the coolant circuit. If both coolant hoses (supply and return)
of engine are interchanged, coolant is flowing in the wrong di‐
rection through the heater core. Refer to⇒ Engine Mechanical;
Rep. Gr. 19 ; Description and Operation .
♦ Heat output and temperature door activation, checking refer
to
⇒ “3.1 Heat Output and Temperature Door Activation, Check‐
3.3
Electrical Components Controlled by
Heating System, Checking
From the Climatronic control module -J255-
The vehicle electrical components that are activated by heater are
identical to those on vehicles with A/C. The electrical test for the
various components is therefore performed in the same way as
the test for these components on vehicles with an A/C system.
Refer to Vehicle diagnosis, testing and information system -
VAS5051B- in the "Guided Fault Finding" function.
These components are activated and function the same way on
a vehicle without A/C (vehicles with a heater only). Refer to
⇒ “4.4 Components Actuated by A/C System, Electrical Test“,
and Vehicle diagnosis, testing and information system
-VAS5051B- in the "Guided Fault Finding" function.
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
16
Rep. Gr.80 - Heating, Ventilation