Components In Engine Compartment and on Rear
Components in Engine Compartment and On Rear
1 Sunroof with solar cells
• Checking function. Refer to => [ Solar Roof Electrical Test ] Solar Roof Electrical Test
• Remove and install. Refer to => Sunroof / Moonroof Sunroof / Moonroof
2 Service connection
• Low pressure side
• Used for measuring, discharging and recharging by A/C system service point workshops
• Cap with seal; always to be screwed on
3 Dust and pollen filter
• Removing and installing. Refer to => [ Dust and Pollen Filter ] A/C System Control and Regulation Components
• Observe replacement intervals.
• Different versions (with and without activated charcoal filter element. Refer to => [ Dust and Pollen Filter with Activated Charcoal Filter Unit ] A/C System Control and Regulation Components)
4 Union in refrigerant pipe (with restrictor)
• Threaded connection must only be opened with refrigerant circuit discharged; deliver vehicle to an A/C system service point workshop
5 Service connection
• High pressure side
• Used for measuring, discharging and recharging by A/C system service point workshops
• Cap with seal; always to be screwed on
6 Air Quality Sensor (G238)
• Function, refer to => [ Air Quality Sensor Function ] Air Quality Sensor Function
• Checking, refer to => [ Air Quality Sensor, Checking ] Air Quality Sensor Function
• Removing and installing, refer to => [ Air Quality Sensor ] A/C System Control and Regulation Components
7 Heated windshield control module (J505)
• Function, refer to => [ Heated Windshield Function ] Heated Windshield
• Put out of operation, refer to => [ Windshield Heater, Deactivating ] Heated Windshield
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8 Reservoir
• Must only be removed with refrigerant circuit discharged; deliver vehicle to an A/C system service point workshop
• Removing and installing, refer to => [ Reservoir ] Service and Repair
9 Coolant fan control module (J293) 2)
• The request to switch on the coolant fan(s) (V7 ) is sent by the Climatronic control module ( J255) A/C control head via the data bus system to the engine control module.
• Depending on the version of the Climatronic control module (J255) A/C control head, the coolant fan is switched on immediately in the A/C system mode when the compressor is switched on or the coolant fan is only activated when a pressure of approx. 9 bar is exceeded in the refrigerant circuit.
• Continuously switches the coolant fan(s) (V7) to the desired output.
• Is installed in various versions and at various locations depending on the vehicle equipment.
• Read the measured value block, display group "014". Refer to => Vehicle Diagnosis, Testing and Information System VAS 5051 in the "guided fault finding" function,
10 Condenser
• Must only be removed with refrigerant circuit discharged; deliver vehicle to an A/C system service point workshop
• Refrigerant lines, disconnecting and reconnecting, refer to => [ Refrigerant Lines, Disconnecting and Connecting from Condenser ] Refrigerant Circuit, Servicing
• Condenser, removing and installing, refer to => [ Condenser ] Service and Repair
11 Outside Air Temperature Sensor (G17)
• Removing
- Unplug the connector from the outside air temperature sensor (G17) and unclip from the mount in the air guide. Removal and Installation
• Resistance values, refer to => [ Temperature Sensor Temperature-Dependent Resistance Values ] Climatronic Control Module A/C Control Head Electrical Test
• The measured value of the outside air temperature sensor (G17) is evaluated by the instrument cluster control module (J285) and transmitted via the comfort data bus system to the Climatronic control module (J255) A/C control head. Refer to => Vehicle Diagnosis, Testing and Information System VAS5051 in the "Guided Fault Finding" function
12 A/C compressor regulator valve (N280) 1), 2).
• Checking activation and function, refer to => [ Test Step 6 ] Climatronic Control Module A/C Control Head Electrical Test.
13 Compressor
• Compressor, removing from bracket and reinstalling, refer to => [ Compressor, Removing from Bracket ] Compressor, Removing From Bracket
• Refrigerant line, disconnecting from compressor and connecting, refer to => [ Refrigerant Lines, Disconnecting and Connecting from Compressor ] Refrigerant Lines, Disconnecting and Connecting From Compressor
• Compressor, removing and installing, refer to => [ Compressor, 4- or 6-Cylinder ]
• The type of compressor differs depending on the engine (installed on the right or left of the engine, 6-cylinder gasoline engine, 8-cylinder engine).
• Depending on the country version, various compressor types are installed (e.g. "Denso" type designation "6 SEU" for Europe and "7 SEU" for countries with a hot climate).
• Ribbed belt, removing and installing, refer to =>
Engine Mechanical Engine
• Replacing belt pulley.
• Check and replace the compressor drive unit, refer to => [ Compressor Drive Unit ] Compressor Drive Unit
CAUTION!
The compressor may be removed only when the refrigerant circuit is empty.
14 High Pressure Sensor (G65) 1)
• Function, removing and installing, refer to => [ High Pressure Sensor ] Service and Repair
• The measured value of the high pressure sensor ( G65) is displayed in the measured value block (display group " 001") of the Climatronic control module (J255) A/C control head. Refer to => [ Test Step 5 ] Climatronic Control Module A/C Control Head Electrical Test and => [ High Pressure Sensor Pressure Signal ] Climatronic Control Module A/C Control Head Electrical Test
15 Forced air extractor
• Sealing lips of vent frame must move freely and close automatically
• In order for the vehicle interior ventilation to function properly, the air ducts that run through the luggage compartment trim must be unobstructed.
• Checking, refer to => [ Vent Frame, Checking ]