Audi Q3: Cooling Output, Checking
Cooling Output, Checking
Special tools and workshop equipment
required
- Vehicle Diagnostic Tester
- A standard thermometer (for temperature measurements, if
necessary a thermometer with two measuring probes for
simultaneous measurement, for example, for temperature on the
right and left)
Note
- With the Start/Stop System, the stop function is disabled
depending on the setting on the A/C Control Module -J301- (for
example, the heater is on). As soon as there is a request for
heating, the engine is started. In cooling mode, the A/C Control
Module -J301- does not limit the stop function. Refer to Vehicle
Diagnostic Tester in the "Guided Fault Finding" function.
- With the Start/Stop Function, the stop function is disabled
depending on the setting on the Climatronic Control Module
-J255- control head. If, for example, "Defrost" mode is
selected, the stop function is not possible or is cancelled and
the engine is started as soon as this mode is selected. The same
applies in the case of heating and cooling. The difference
between the target and actual temperature is greater than a
specified value. Refer to Vehicle Diagnostic Tester in the
"Guided Fault Finding" function.
A/C Cooling Output, Testing Requirements
- The ambient temperature is greater than 15 ºC (60 ºF).
- Radiator and condenser are clean (if necessary, clean).
- The ribbed belt, which drives the Air Conditioning (A/C)
compressor, is OK and is tensioned correctly. The belt pulley is
actually driving the A/C compressor. Refer to
→ Chapter "Overview - Belt Pulley".
- All air ducts, covers and seals are OK and properly
installed.
- Air flow through dust and pollen filter not obstructed by
dirt. Refer to
→ Chapter "Dust and Pollen Filter, Removing and Installing".
- The air intake of the A/C unit (in fresh air and
recirculating air mode) is not impaired by soiling or components
installed as retrofit.
- For the glove compartment cooling, the air guide to the
glove compartment cooling is installed as specified (without
glove compartment cooling, the connection for it is sealed).
Refer to
→ Chapter "Air Guide for Glove Compartment Cooling, Removing and
Installing".
- The vehicle is not exposed to sunlight.
- The engine is warm (the coolant temperature is higher than
80 ºC (176 ºF) ).
- The Diagnostic Trouble Code (DTC) memory for the Climatronic
Control Module -J255-/A/C Control Module -J301- control head was
checked and erased, the basic setting was performed and the
Climatronic Control Module -J255- coding was checked on the
Vehicle Diagnostic Tester in the "Guided Fault Finding"
function.
- The adaption for the Climatronic Control Module -J255- was
checked. Refer to Vehicle Diagnostic Tester in the "Guided Fault
Finding".
- All instrument panel vents and, if equipped, the vents in
the rear center console are opened.
- The vent for glove compartment cooling (in the glove
compartment) is closed for the glove compartment cooling.
- Ensure that the air outlet from the rear footwell vents
(under the front seats) is not blocked by floor mats or other
objects.
- The hood is closed.
- The engine is running.
Adjust the following settings on the A/C Control Module
-J301- control head:
- Turn the temperature knob -1-
to the "cold" stop.
- The A/C compressor is on - the indicator lamp in the
AC or A/C
button -2- illuminates.
- The recirculating air mode is on - the indicator lamp in the
recirculation button
-3- illuminates.
- Turn the knob -5- for the fresh
air blower to level "4".
Adjust the following settings on the Climatronic Control
Module -J255- control head:
- "Auto" mode - the indicator lamp in the
AUTO button -10-
illuminates.
- Temperature preset "cold" via the knobs
-2 and 8- - "LO" for the driver and
front passenger side in the display -6-
on the Climatronic Control Module -J255-.
- The A/C compressor is on - the indicator lamp in the
AC or A/C
button -1- illuminates.
- Preselect for the fresh air blower -5-"maximum
speed" - in the display on the Climatronic Control Module
-J255-.
Note
- The indicator lamps in the AUTO
buttons go out when the fresh air blower speed is changed
manually.
- The maximum possible fresh air blower speed depends on
several conditions (vehicle voltage, etc.)
Functions with Engine Running:
- The coolant fan(s) (Coolant Fan -V7- and Coolant Fan 2
-V177-) run (activation and speed depend on refrigerant circuit
pressure and engine temperature).
Note
- Depending on the version of the Climatronic Control Module
-J255- control head, the coolant fan(s) (Coolant Fan -V7- and
Coolant Fan 2 -V177-) are only switched on at a certain
refrigerant circuit pressure (currently at a pressure of
approximately 9 bar). The activation of the coolant fan(s) is
displayed in the "read measured value" function. Refer to
Vehicle Diagnostic Tester in the "Guided Fault Finding"
Function.
- Depending on the engine control module, the target and the
actual speed of the Coolant Fans -V7- and Coolant Fan 2 -V177-
can vary from one another. Refer to Vehicle Diagnostic Tester in
the "Guided Fault Finding" function.
- The fresh air blower runs at maximum speed.
Note
The maximum possible fresh air blower speed depends on
several conditions (vehicle voltage, etc.)
- The A/C system goes in recirculating air mode (approximately
one minute after starting the engine, the back pressure/fresh
air door is closed and the air recirculation door is opened. The
fresh air blower extracts the air from passenger compartment
below instrument panel / behind the glove compartment).
If one of these requirements is not met:
- Check the DTC memory, perform an output diagnostic test and
read the measured values. Refer to Vehicle Diagnostic Tester in
the "Guided Fault Finding" function.
READ NEXT:
Procedure
The requirements for testing the cooling capacity are
fulfilled. Refer to
→ Chapter "A/C Cooling Output, Testing Requirements".
- Measure the ambient temperature (must
Procedure
The requirements for testing the cooling capacity are
fulfilled. Refer to
→ Chapter "A/C Cooling Output, Testing Requirements".
- Measure the ambient temperature (must
Refrigerant is never to be allowed to escape into the
atmosphere, but rather it is to be extracted from the
refrigerant circuit using an Air Conditioning (A/C) service
station. The drained refri
SEE MORE:
1 - Storage Compartment Illumination Bulb -L120- in the Front Center
Console
Equipment level
Removing and installing. Refer to
→ Chapter "Storage Compartment Illumination Bulb -L120-, Removing and
Installing".
2 - Front Passenger Door Storage Compartment I
Removing
- Remove the upper A-pillar trim. Refer to
→ Body Interior; Rep. Gr.70; Passenger Compartment Trim;
A-Pillar Trim, Removing and Installing.
- Remove the front sill panel strip. Refer to
→ Body Interior; Rep. Gr.70; Passenger Compartment Trim