Audi Q3: Heating Output, Checking
Heating Output, Checking
Note
This repair manual only outlines the checking procedure.
Perform the detailed function test for the heating as described
in the Guided Fault Finding using the Vehicle Diagnostic Tester
in the "Guided Fault Finding" function.
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)
- If the coolant circuit is not completely bled after filling,
air may accumulate in the heater core for the heater, reducing
heating output. Additional noises may occur or the customer may
report different air temperatures coming out of the driver and
passenger side vents.
Corrective action for poor heating output or noises from
coolant circuit:
- Perform a test drive at high engine speed (at least 10
minutes, engine speed above 2500 RPM), while selecting a low
gear to prevent excessive vehicle speed.
- If the customer complains of poor heating output at certain
engine speeds, check the incorporation of the heater core for
the heater in the engine coolant circuit. Refer to
→ Engine Mechanical, Fuel Injection and Ignition; Rep.
Gr.19; Cooling System/Coolant; Connection Diagram - Coolant
Hoses.
Note
- For vehicles with the start-stop function and manual climate
control system (heater without A/C system), the stop function is
disabled depending on the setting on the A/C Control Module
-J301- (the Heater Control Module -J65-) control head (for
example, the heater is on). As soon as there is a request for
heating, the engine is started. In the cooling mode, the A/C
Control Module -J301- (the Heater Control Module -J65-) does not
limit the stop function.
- For vehicles with a start-stop function and an automatic
climate control system, 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 mode. The difference between the
selected target and measured actual temperature exceeds a
certain value. Refer to Vehicle Diagnostic Tester.
- For vehicles with the Start/Stop System, there is currently
no additional coolant pump installed for the start-stop
function. Depending on the engine, however, an electrical
coolant pump that is activated by the engine control module may
be present. Refer to
→ Engine Mechanical, Fuel Injection and Ignition; Rep.
Gr.19; Coolant Pump/Thermostat; Overview - Electric Coolant Pump
and
→ Wiring diagrams, Troubleshooting & Component locations.
- Depending on the engine version to support the engine
coolant pump an After-Run Coolant Pump -V51-/Heater Support Pump
-V488- may be installed (different designations depending on the
engine). Refer to
→ Engine Mechanical; Rep. Gr.19; Coolant System/Coolant
(Connection Diagram for Coolant Hoses) and
→ Wiring diagrams, Troubleshooting & Component locations.
The After-Run Coolant Pump -V51-/Heater Support Pump -V488- can
be actuated in "stop mode" (engine stopped) to maintain the
coolant flow rate through the heater core for the heater on with
a cold engine or on vehicles with a Start/Stop System.
Heating Output, Checking, Heater without A/C System
Test Prerequisites
- The coolant circuit has been bled according to the
specifications. Refer to
→ Engine Mechanical, Fuel Injection and Ignition; Rep.
Gr.19; Cooling System/Coolant; Coolant, Draining and Filling
- All air guides, covers and seals are OK and properly
installed.
- The airflow through the dust and pollen filter is not
affected by dirt in the filter. To check, refer to
→ Chapter "Dust and Pollen Filter, Removing and Installing".
- The Temperature Regulator Door Motor -V68- and the related
doors reach their end position. To check, refer to "Guided Fault
Finding"Vehicle Diagnostic Tester.
- The vehicle is not exposed to sunlight.
- The engine is warm.
- The Diagnostic Trouble Code (DTC) memory for the Heater
Control Module -J65- control head was checked and erased and the
basic setting was performed in the "Guided Fault Finding"
function on the Vehicle Diagnostic Tester.
Checking
Note
This illustration shows an A/C control head for a manual
climate control system (the A/C Control Module -J301-). For the
Heater Control Module -J65- (on a vehicle without an A/C
system), A/C button
-2- is not present.
- Close the engine hood, doors, windows and sunroof.
- Open all instrument panel vents.
- Start the engine and adjust the following settings on the
control head:
- Turn the temperature knob -1-
to the "cold" stop.
- Let the heater run several minutes with the "cold" setting
(with the engine running).
- Measure the ambient temperature near the windshield.
- Turn the air distribution knob -4-
to the "instrument panel vent" stop.
- Turn the knob -5- for the fresh
air blower to level "4".
- Measure temperature of the air flowing out of left and right
instrument panel vents using a thermometer.
Specified values:
- If the measured value for the Evaporator Vent Temperature
Sensor -G263- is evaluated using the Vehicle Diagnostic Tester
(in the "Guided Fault Finding" function). Compare the measured
values with the displayed measured value (of the Evaporator Vent
Temperature Sensor -G263-). The measured values may not be
smaller and after 5 minutes, may be a maximum of 5 ºC (41 ºF)
greater than the value of the Evaporator Vent Temperature Sensor
-G263-.
- If the measured value for the Evaporator Vent Temperature
Sensor -G263- is not evaluated using the Vehicle Diagnostic
Tester (in the "Guided Fault Finding" function). After five
minutes, the temperature of the air coming out the left and
right instrument panel vents may be a maximum 15 ºC (59 ºF)
greater than the ambient temperature measured beforehand.
- Set the highest possible temperature.
- Turn the temperature regulator -1-
to the "warm" stop.
- Measure temperature of the air flowing out of left and right
instrument panel vents using a thermometer.
Specified values:
- Temperature increases to greater than 55 ºC (131 ºF) (at an
engine temperature of approximately 90 ºC (194 ºF) ). The
deviation between the left and right side is less than 8 ºC (46
ºF) .
- Set the lowest temperature possible (temperature knob at
"cold" stop).
- Measure temperature of the air flowing out of left and right
instrument panel vents using a thermometer.
Specified values:
- If the measured value for the Evaporator Vent Temperature
Sensor -G263- is evaluated using the Vehicle Diagnostic Tester
(in the "Guided Fault Finding" function). Compare the measured
values with the displayed measured value (of the Evaporator Vent
Temperature Sensor -G263-). The measured values may not be
smaller and after 5 minutes, may be a maximum of 5 ºC (41 ºF)
greater than the value of the Evaporator Vent Temperature Sensor
-G263-.
- If the measured value for the Evaporator Vent Temperature
Sensor -G263- is not evaluated using the Vehicle Diagnostic
Tester (in the "Guided Fault Finding" function). After five
minutes, the temperature of the air coming out the left and
right instrument panel vents may be a maximum 15 ºC (59 ºF)
greater than the ambient temperature measured beforehand.
If the specified values are not reached, check the
following:
- The coolant circuit bleeding. Refer to
→ Engine Mechanical, Fuel Injection and Ignition; Rep.
Gr.19; Cooling System/Coolant; Coolant, Draining and Filling
- The incorporation of the heater core for the heater in the
coolant circuit. Refer to
→ Engine Mechanical, Fuel Injection and Ignition; Rep.
Gr.19; Cooling System/Coolant; Connection Diagram - Coolant
Hoses
- Foam seal on the heater core for the heater. Refer to
→ Chapter "Heater Core, Removing and Installing".
- Check the activation and function of the Temperature
Regulator Door Motor -V68- using the Vehicle Diagnostic Tester
in the "Guided Fault Finding" function.
- Function of temperature door in air distribution housing.
Refer to
→ Chapter "Overview - Air Distribution Housing Doors and
Partitions".
- Check the coolant thermostat (if the thermostat is faulty,
the engine coolant temperature may not be warm enough). Refer to
→ Rep. Gr.19; Coolant Pump/Thermostat.
- If equipped, the function of the After-Run Coolant Pump
-V51-/Heater Support Pump -V488- (different designations
depending on the engine). Refer to
→ Engine Mechanical; Rep. Gr.19; Coolant System/Coolant.
Note
Depending on the engine version to support the engine
coolant pump an After-Run Coolant Pump -V51-/Heater Support Pump
-V488- may be installed (different designations depending on the
engine). Refer to
→ Engine Mechanical; Rep. Gr.19; Coolant System/Coolant
(Connection Diagram for Coolant Hoses) and
→ Wiring diagrams, Troubleshooting & Component locations.
The After-Run Coolant Pump -V51-/Heater Support Pump -V488- can
be actuated in "stop mode" (engine stopped) to maintain the
coolant flow rate through the heater core for the heater on with
a cold engine or on vehicles with a Start/Stop System.
Heating Output, Checking, Manual Climate Control System
Test Prerequisites
- The coolant circuit has been bled according to the
specifications. Refer to
→ Engine Mechanical, Fuel Injection and Ignition; Rep.
Gr.19; Cooling System/Coolant; Coolant, Draining and Filling
- All air guides, covers and seals are OK and properly
installed.
- The airflow through the dust and pollen filter is not
affected by dirt in the filter. To check, refer to
→ Chapter "Dust and Pollen Filter, Removing and Installing".
- If the A/C cooling output is checked and found to be OK,
refer to
→ Chapter "Cooling Output, Checking".
- The vehicle is not exposed to sunlight.
- The engine is warm.
- The Diagnostic Trouble Code (DTC) memory for the A/C Control
Module -J301- control head was checked and erased and the basic
setting was performed in the "Guided Fault Finding" function on
the Vehicle Diagnostic Tester.
Checking
- Close the engine hood, doors, windows and sunroof.
- Open all instrument panel vents.
- Start the engine and adjust the following settings on the
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.
- Let the A/C system run for several minutes at maximum
cooling output (while the engine is running).
- Turn the air distribution knob -4-
to the "instrument panel vent" stop.
- Turn the knob -5- for the fresh
air blower to level "4".
- Measure temperature of the air flowing out of left and right
instrument panel vents using a thermometer.
- Compare the measured values with the displayed measured
value (for the Evaporator Vent Temperature Sensor -G263-). The
measured values may not be smaller and after 5 minutes, may be a
maximum of 3 ºC (37 ºF) greater than the value of the Evaporator
Vent Temperature Sensor -G263-.
Specified values:
- Temperature maximum 12 ºC (54 ºF), depending on ambient
temperature, the difference between the measured values is less
than 3 ºC (37 ºF).
- Set the highest possible temperature.
- Turn the temperature regulator -1-
to the "warm" stop.
- Measure temperature of the air flowing out of left and right
instrument panel vents using a thermometer.
Specified values:
- Temperature increases to greater than 55 ºC (131 ºF) (at an
engine temperature of approximately 90 ºC (194 ºF) ). The
deviation between the left and right side is less than 8 ºC (46
ºF).
- Set the lowest temperature possible (temperature knob at
"cold" stop).
- Measure temperature of the air flowing out of left and right
instrument panel vents using a thermometer.
Specified values:
- Temperature decreases within 5 minutes to less than 12 ºC
(54 ºF) depending on ambient temperature.
If the specified values are not reached, check the
following:
- The coolant circuit bleeding. Refer to
→ Engine Mechanical, Fuel Injection and Ignition; Rep.
Gr.19; Cooling System/Coolant; Coolant, Draining and Filling
- The incorporation of the heater core for the heater in the
A/C unit into the coolant circuit. Refer to
→ Engine Mechanical, Fuel Injection and Ignition; Rep.
Gr.19; Cooling System/Coolant; Connection Diagram - Coolant
Hoses.
- The foam seal on heater core for heater of A/C unit
→ Chapter "Heater Core, Removing and Installing".
- Check the activation and function of the Temperature
Regulator Door Motor -V68- using the Vehicle Diagnostic Tester
in the "Guided Fault Finding" function.
- Function of temperature door in air distribution housing.
Refer to
→ Chapter "Overview - Air Distribution Housing Doors and
Partitions".
- Check the coolant thermostat (if the thermostat is faulty,
the engine coolant temperature may not be warm enough). Refer to
→ Rep. Gr.19; Coolant Pump/Thermostat.
- If equipped, the function of the After-Run Coolant Pump
-V51-/Heater Support Pump -V488- (different designations
depending on the engine). Refer to
→ Engine Mechanical; Rep. Gr.19; Coolant System/Coolant.
Note
Depending on the engine version to support the engine
coolant pump an After-Run Coolant Pump -V51-/Heater Support Pump
-V488- may be installed (different designations depending on the
engine). Refer to
→ Engine Mechanical; Rep. Gr.19; Coolant System/Coolant
(Connection Diagram for Coolant Hoses) and
→ Wiring diagrams, Troubleshooting & Component locations.
The After-Run Coolant Pump -V51-/Heater Support Pump -V488- can
be actuated in "stop mode" (engine stopped) to maintain the
coolant flow rate through the heater core for the heater on with
a cold engine or on vehicles with a Start/Stop System.
Heating Output, Checking, Automatic Climate Control System
Test Prerequisites
- The coolant circuit has been bled according to the
specifications. Refer to
→ Engine Mechanical, Fuel Injection and Ignition; Rep.
Gr.19; Cooling System/Coolant; Coolant, Draining and Filling
- All air guides, covers and seals are OK and properly
installed.
- The airflow through the dust and pollen filter is not
affected by dirt in the filter. Refer to
→ Chapter "Dust and Pollen Filter, Removing and Installing".
- If the Air Conditioning (A/C) cooling output is checked and
found to be OK, refer to
→ Chapter "Cooling Output, Checking".
- The vehicle is not exposed to sunlight.
- The engine is warm.
- The Diagnostic Trouble Code (DTC) memory for the Climatronic
Control Module -J255- control head was checked and erased and
the basic setting was performed on the Vehicle Diagnostic Tester
in the "Guided Fault Finding" function.
- The coding and adaptation of the Climatronic Control Module
-J255- control head in the "Guided Fault Finding" function on
the Vehicle Diagnostic Tester.
Checking
- Close the engine hood, doors, windows and sunroof.
- Open all instrument panel vents.
- Start the engine and adjust the following settings on the
control head:
- Set the temperature preset "cold" via the temperature preset
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.
- Set the air distribution to the instrument panel vents
-9-.
- Let the A/C system run for several minutes at maximum
cooling output (while the engine is running).
- Read the measured values for the Left/Right Vent Temperature
Sensor-G150-/-G151- in the "Guided Fault Finding" function on
the Vehicle Diagnostic Tester.
- Compare the displayed measured values with each other.
Specified values:
- Temperature maximum 12 ºC (54 ºF) (depending on ambient
temperature), deviation between measured values less than 3 ºC
(37 ºF).
Note
Using a hand, check if there is actually air coming out of the
activated vents.
- Set the highest possible temperature for the driver side.
- Set the temperature preset "warm" via the knob
-2-: "HI" for the driver side in
the display -6- on the Climatronic
Control Module -J255-.
- Read the measured values for the Left/Right Vent Temperature
Sensor -G150-/Right Vent Temperature Sensor -G151-.
Specified values:
- In the display field with the measured value for the
Left/Right Vent Temperature Sensor -G150-, the temperature goes
above 55 ºC (131 ºF) (when the engine temperature is
approximately 90 ºC (194 ºF) ).
- In the display field with the measured value for the Right
Vent Temperature Sensor -G151-, the temperature increases less
than 10 ºC (50 ºF) (when the engine temperature is approximately
90 ºC (194 ºF) ).
- Set the highest possible temperature.for the front passenger
side.
- Set the temperature preset "warm" via the knob
-8-: "HI" for the front passenger
side in the display -6- on the
Climatronic Control Module -J255-.
- Read the measured values for the Left/Right Vent Temperature
Sensor Left/Right Vent Temperature Sensor -G150-/Right Vent
Temperature Sensor -G151-.
Specified values:
- In the display field with the measured value for the Right
Vent Temperature Sensor -G151-, the temperature goes above 55 ºC
(131 ºF) (when the engine temperature is approximately 90 ºC
(194 ºF) ).
- The deviation between the display fields for the measured
values of the Left/Right Vent Temperature Sensor -G150-/Right
Vent Temperature Sensor -G151- is less than 8 ºC (46 ºF).
- Set the lowest possible temperature for the driver and front
passenger side.
- Set the 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-.
- Read the measured values for the Left/Right Vent Temperature
Sensor -G150-/Right Vent Temperature Sensor -G151-.
Specified values:
- The temperature decreases within 5 minutes to less than 12
ºC (54 ºF) on the driver- and front passenger side, depending on
ambient temperature.
If the specified values are not reached, check the
following:
- The coolant circuit bleeding. Refer to
→ Engine Mechanical, Fuel Injection and Ignition; Rep.
Gr.19; Cooling System/Coolant; Coolant, Draining and Filling
- The incorporation of the heater core for the heater in the
A/C unit into the coolant circuit. Refer to
→ Engine Mechanical, Fuel Injection and Ignition; Rep.
Gr.19; Cooling System/Coolant; Connection Diagram - Coolant
Hoses.
- The activation and function of the Left Temperature Door
Motor -V158-/Right Temperature Door Motor -V159--V159- using the
Vehicle Diagnostic Tester in the "Guided Fault Finding"
function.
- Foam seal on heater core for the heater of A/C unit. Refer
to
→ Chapter "Heater Core, Removing and Installing".
- Function of temperature door in air distribution housing.
Refer to
→ Chapter "Air Intake and Outlet Openings, Heater and A/C Unit".
- Check the coolant thermostat (if the thermostat is faulty,
the engine coolant temperature may not be warm enough). Refer to
→ Rep. Gr.19; Coolant Pump/Thermostat.
- If equipped, the function of the After-Run Coolant Pump
-V51-/Heater Support Pump -V488- (different designations
depending on the engine). Refer to
→ Engine Mechanical; Rep. Gr.19; Coolant System/Coolant.
Note
Depending on the engine version to support the engine
coolant pump an After-Run Coolant Pump -V51-/Heater Support Pump
-V488- may be installed (different designations depending on the
engine). Refer to
→ Engine Mechanical; Rep. Gr.19; Coolant System/Coolant
(Connection Diagram for Coolant Hoses) and
→ Wiring diagrams, Troubleshooting & Component locations.
The After-Run Coolant Pump -V51-/Heater Support Pump -V488- can
be actuated in "stop mode" (engine stopped) to maintain the
coolant flow rate through the heater core for the heater on with
a cold engine or on vehicles with a Start/Stop System.
READ NEXT:
Cooling Output, Checking
Special tools and workshop equipment
required
Vehicle Diagnostic Tester
A standard thermometer (for temperature measurements, if
necessary a thermometer with two me
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
SEE MORE:
Overview - Front Brake Caliper, Single-Piston Brake
1 - Protective Cap
Place on the bleed screw
2 - Bleeder Screw
10 Nm
Before installing, lightly coat the thread with Lithium Grease -G
052 150 A2-.
3 - Caps
Insert in bushing
4 -&nb
General information
Applies to: vehicles with Audi connect Infotainment and online
radio
You can listen to various radio stations or podcasts
on the Internet using online radio.
Requirement: the MMI must be connected to the
Internet. A data plan must be available.
Accessing online radio through the