Heating Output And Temperature Control Door Activation, Checking, Vehicles With Automatic Climate Control System

WARNING: This page is about a different variant/trim than selected.

Refer to HEAT OUTPUT TEST INFORMATION AND TOOLS REQUIRED

Test Requirements

Coolant circuit bled according to specifications. Refer to COOLANT, DRAINING AND FILLING [DAZA] / COOLANT, DRAINING AND FILLING [CNTC, CYFB] .
All air ducts, covers and seals are OK and properly installed.
Seal between engine compartment, hood and plenum chamber is OK and installed correctly. Refer to Bulkhead ; (Overview - Plenum Chamber Cover) to check.
The airflow through the dust and pollen filter is not obstructed by dirt. Refer to DUST AND POLLEN FILTER, REMOVING AND INSTALLING to check.
The air intake of the heater and A/C unit (in fresh air and recirculating air modes) is not obstructed by dirt or retrofitted components.
If installed: After-Run Coolant Pump -V51- and the Coolant Shut-Off Valve -N82- function is OK.
The vehicle is not exposed to sunlight.
The A/C system cooling output was checked and is OK. Refer to COOLING OUTPUT, CHECKING, VEHICLES WITH AUTOMATIC CLIMATE CONTROL SYSTEM .
Engine is warm: Coolant temperature is greater than 80 °C (176 °F).
The DTC memory for the Climatronic Control Module -J255- was checked and erased and the basic setting was performed using the Vehicle Diagnostic Tester in the"Guided Fault Finding" function.
The coding and adaptation of the Climatronic Control Module -J255- was checked using the Vehicle Diagnostic Tester in the"Guided Fault Finding" function.
Vehicles with TDI engine: The activation and function of the Auxiliary Heater Heating Element -Z35- is OK. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding" function (for the Engine Control Module -J623-).
Vehicles with a gasoline engine and an Auxiliary Heater Heating Element -Z35- (introduction not yet finalized): Activation and function of the Auxiliary Heater Heating Element -Z35- is OK. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding" function.

Checking

-- Close the doors, hood, windows, sliding sunroof and rear lid.

-- Open all instrument panel vents.

-- Start the engine and adjust the following settings on the control head:

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NOTE:

This illustration shows the layout of the regulators -1, 2 and 3- and the buttons -4 and 5- on a left-hand drive vehicle. The layout may be different on right-hand drive vehicles.

The information in the regulators -1, 2 and 3- is only displayed when the ignition is switched on and goes out when the ignition is switched off.

Turn the regulator -1- (Front A/C Display Control Head 2 -E775-) for the fresh air blower to the maximum speed.
Turn the regulator -2- (Front A/C Display Control Head 3 -E776-) for the temperature setting to the "cold" stop.
Turn the regulator -3- (Front A/C Display Control Head 4 -E777-) for air distribution to "instrument panel vent".
A/C compressor on: The indicator lamp in the A/C button (in regulator -1-) illuminates.
Recirculating air mode off: The indicator lamp for "recirculating air mode" in the Recirculation button (in the regulator -3-) does not come on.
"Auto" mode on: The indicator lamp in the Auto button (in the regulator -2-) illuminates.
Defrost mode off: The indicator lamp in the Defrost Button -E782- -4- does not come on.

-- Let the A/C system run for several minutes at maximum cooling output with the engine running.

-- "Read the measured values" for the Left Vent Temperature Sensor -G150- (or Right Vent Temperature Sensor -G151-) and the Evaporator Vent Temperature Sensor -G263- using the Vehicle Diagnostic Tester in the"Guided Fault Finding" function (for the Climatronic Control Module -J255-).

NOTE:

The designation and the component location of the vent temperature sensors (Left Vent Temperature Sensor -G150- and Right Vent Temperature Sensor -G151-) is different. The Left Vent Temperature Sensor -G150- is installed in the air duct to the left instrument panel vent -1- on left-hand drive vehicles. The Right Vent Temperature Sensor -G151- is installed in the air duct to the right instrument panel vent on right-hand drive vehicles.

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-- Measure the temperature of the air coming out of the right instrument panel vent -2- with a thermometer (left vent on a right-hand drive vehicle).

-- Compare the measured values of the Left Vent Temperature Sensor -G150- (or Right Vent Temperature Sensor -G151-), Footwell Vent Temperature Sensor -G192- and the temperature measured using a thermometer with the measured value for the Evaporator Vent Temperature Sensor -G263-.

Specified Values:

The measured values for the Left Vent Temperature Sensor -G150- (or Right Vent Temperature Sensor -G151-), Footwell Vent Temperature Sensor -G192- and the measured temperature must not be smaller than the value for the Evaporator Vent Temperature Sensor -G263- and also not greater than a maximum of 7 °C (45 °F) after five minutes. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding" function (for the Climatronic Control Module -J255-).
The deviation between the measured value for the Left Vent Temperature Sensor -G150- (or Right Vent Temperature Sensor -G151-) and the temperature measured with the thermometer must not be greater than 8 °C (46 °F).

NOTE:

Using a hand, check if there is actually air coming out of the activated vents.

Depending on the selected temperature, both the Left Temperature Control Door Motor -V158- and Right Temperature Control Door Motor -V159- are rotated together between the end stops programmed in the "basic setting" function. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding" function (for the Climatronic Control Module -J255-).

-- Set the highest possible temperature.

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Preselect "Warm" via the regulator -2- (Front A/C Display Control Head 3 -E776-) for the temperature setting ("HI").

-- "Read the measured values" for the Left Vent Temperature Sensor -G150- (or Right Vent Temperature Sensor -G151-) and Footwell Vent Temperature Sensor -G192-.

-- Measure the temperature of the air coming out of the right instrument panel vent with a thermometer (left vent on a right-hand drive vehicle).

NOTE:

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Specified values with an engine temperature of approximately 90 °C (194 °F):

The temperature increases to above 55 °C (131 °F) in the display field with the measured value for the Left Vent Temperature Sensor -G150- (or Right Vent Temperature Sensor -G151-) and Footwell Vent Temperature Sensor -G192-.
The temperature deviation between the left and right side is less than 8 °C (46 °F).

Coolant circuit bleeding. Refer to COOLANT, DRAINING AND FILLING [DAZA] / COOLANT, DRAINING AND FILLING [CNTC, CYFB] .
Incorporation of the heater core for the heater in the coolant circuit. Refer to COOLANT SYSTEM/COOLANT [DAZA] / COOLANT SYSTEM/COOLANT [CNTC, CYFB] (Connection Diagram for Coolant Hoses).
Foam seal on the heater core for the heater. Refer to HEATER CORE, REMOVING AND INSTALLING .
Activation and function of the Left Temperature Control Door Motor -V158- and the Right Temperature Control Door Motor -V159-. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding" function (for the Climatronic Control Module -J255-).
Measured values for the Left Vent Temperature Sensor -G150- (or Right Vent Temperature Sensor -G151-) and Footwell Vent Temperature Sensor -G192-. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding" function (for the Climatronic Control Module -J255-).
Function of the temperature control doors for the left and right side in the heater and A/C unit. Refer to AIR DISTRIBUTION HOUSING, REMOVING AND INSTALLING .
Engine coolant thermostat. The engine coolant may not heat properly if the coolant thermostat is faulty. Refer to COOLANT PUMP/COOLANT THERMOSTAT [DAZA] / COOLANT PUMP/COOLANT THERMOSTAT [CNTC, CYFB] (Coolant Thermostat, Checking).
Engine coolant pump. Refer to COOLANT PUMP/COOLANT THERMOSTAT [DAZA] / COOLANT PUMP/COOLANT THERMOSTAT [CNTC, CYFB] (Overview - Coolant Pump).
If installed: Check the function of the After-Run Coolant Pump -V51- and the Coolant Shut-Off Valve -N82-. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding" function (for the Engine Control Module -J623-).

NOTE:

For vehicles without an After-Run Coolant Pump -V51-, set the engine speed to approximately 2000 RPM and repeat the test if necessary. If the air temperature goes above 55 °C (131 °F) when repeating the test at a higher engine speed, this indicates that there is too little coolant flowing through the heater core for the heater. Cause: The delivery quantity of the engine coolant pump is too low at idle speed, or the incorporation of the heater core for the heater in the coolant circuit is not according to the specification. Refer to COOLANT SYSTEM/COOLANT [DAZA] / COOLANT SYSTEM/COOLANT [CNTC, CYFB] (Connection Diagram for Coolant Hoses).

If too little warmed up coolant flows through the heater core for the heater, the required heat output is not reached.

-- Set the lowest possible temperature.

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Preselect "Cold" via the regulator -2- (Front A/C Display Control Head 3 -E776-) for the temperature setting ("LO").

-- "Read the measured values" for the Left Vent Temperature Sensor -G150- (or Right Vent Temperature Sensor -G151-), Footwell Vent Temperature Sensor -G192- and Evaporator Vent Temperature Sensor -G263-.

-- Measure the temperature of the air coming out of the right instrument panel vent -2- with a thermometer (left vent on a right-hand drive vehicle).

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NOTE:

The designation and the component location of the vent temperature sensors (Left Vent Temperature Sensor -G150- and Right Vent Temperature Sensor -G151-) is different. The Left Vent Temperature Sensor -G150- is installed in the left instrument panel vent on left-hand drive vehicles. The Right Vent Temperature Sensor -G151- is installed in the right instrument panel vent on right-hand drive vehicles.

Specified Values:

The measured values for the Left Vent Temperature Sensor -G150- (or Right Vent Temperature Sensor -G151-), Footwell Vent Temperature Sensor -G192- and the temperature measured with the thermometer must not be smaller than the value for the Evaporator Vent Temperature Sensor -G263- and also not greater than a maximum of 7 °C (45 °F) after five minutes. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding" function (for the Climatronic Control Module -J255-).
The deviation between the measured values for the Left Vent Temperature Sensor -G150- (or Right Vent Temperature Sensor -G151-), Footwell Vent Temperature Sensor -G192- and the temperature measured with the thermometer must not be greater than 8 °C (46 °F).

If the specified values are not reached, check the following:

Activation and function of the Left Temperature Control Door Motor -V158- and the Right Temperature Control Door Motor -V159-. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding" function (for the Climatronic Control Module -J255-).
Function of the temperature control doors for the left and right side in the heater and A/C unit. Refer to AIR DISTRIBUTION HOUSING, REMOVING AND INSTALLING .
Foam seal on the heater core for the heater. Refer to HEATER CORE, REMOVING AND INSTALLING .
Check the measured values for the Left Vent Temperature Sensor -G150- (or Right Vent Temperature Sensor -G151-), Footwell Vent Temperature Sensor -G192- and Evaporator Vent Temperature Sensor -G263-. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding" function (for the Climatronic Control Module -J255-).