Removing Components From Rear Heating and A/C Unit
Removing Components From Rear Heating and A/C Unit
Interchange of the wire connections to the temperature sensors or the connectors at the control motors results in problems regarding the regulation of the A/C system.
• Interchanged connectors at the control motors or the temperature sensors are not identified as malfunctions by the rear A/C display control head (E265).
• Prior to disconnecting connectors or removing electrical components, clearly label them in order to rule out confusion.
• Remove the rear A/C unit, refer to => [ Rear Heating and A/C Unit ] Rear Heating and A/C Unit.
1 Wiring Harness Of Rear Heating & A/C Unit
• To rule out confusion, clearly label the allocation of connectors to each electrical component prior to disconnection.
• Mark the routing prior to removing the wiring harness from the A/C unit.
2 Left Rear Footwell Vent Temperature Sensor (G637)
• To rule out confusion, clearly label the wire routing and allocation to each installation location prior to disconnecting the connector or removing a temperature sensor.
• Removal and installation, refer to => [ Left Rear Footwell Vent Temperature Sensor (G637) ] Left Rear Footwell Vent Temperature Sensor (G637).
• Check the left rear footwell vent temperature sensor (G637) using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
3 Left Rear Upper Body Vent Temperature Sensor (G635)
• To rule out confusion, clearly label the wire routing and allocation to each installation location prior to disconnecting the connector or removing a temperature sensor.
• Removal and installation, refer to => [ Left Rear Upper Body Vent Temperature Sensor (G635) ] Left Rear Upper Body Vent Temperature Sensor (G635).
• Check the left rear upper body vent temperature sensor (G635) using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
4 Right Rear Footwell Vent Temperature Sensor (G638)
• To rule out confusion, clearly label the wire routing and allocation to each installation location prior to disconnecting the connector or removing a temperature sensor.
• Removal and installation, refer to => [ Right Rear Footwell Vent Temperature Sensor (G638) ] Right Rear Footwell Vent Temperature Sensor (G638).
• Check the right rear footwell vent temperature sensor (G638) using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
5 Right Rear Upper Body Vent Temperature Sensor (G636)
• To rule out confusion, clearly label the wire routing and allocation to each installation location prior to disconnecting the connector or removing a temperature sensor.
• Removal and installation, refer to => [ Right Rear Upper Body Vent Temperature Sensor (G636) ] Right Rear Upper Body Vent Temperature Sensor (G636).
• Check the right rear upper body vent temperature sensor (G636) using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
6 Rear Heating and A/C Unit
• Removal and installation, refer to => [ Rear Heating and A/C Unit ] Rear Heating and A/C Unit.
• Refer to => [ Disassembly Of Rear A/C Unit ] Disassembly Of Rear A/C Unit.
7 Cam Disk
• Mark before removing (risk of interchange).
• Removed during removal of the A/C unit (so that the heater core can be removed), refer to => [ Rear Heating and A/C Unit ] Rear Heating and A/C Unit.
8 Coupling Rod
• Mark before removing (risk of interchange).
• Removed during removal of the A/C unit (so that the heater core can be removed), refer to => [ Rear Heating and A/C Unit ] Rear Heating and A/C Unit.
9 Right Rear Temperature Door Motor (V314)
• Removal and installation, refer to => [ Right Rear Temperature Door Motor (V314) ] Right Rear Temperature Door Motor (V314).
• To rule out confusion, clearly label the wire routing, allocation and control motor for each installation location prior to disconnecting the connector or removing a control motor.
10 Screw
11 Rear Heater Core
• Remove and install, replace (with the A/C unit installed), refer to => [ Rear Heater Core ] Rear Heater Core.
• The rear heater core remains in the vehicle when removing the rear A/C unit (so that the coolant circuit does not need to be opened), refer to => [ Rear Heating and A/C Unit ] Rear Heating and A/C Unit.
• Bonded foam seal, check before installing, refer to => [ Rear Heater Core ] Rear Heater Core.
12 O-ring Seal
• Replace. Refer to Electronic Parts Catalog.
• Lubricate lightly with coolant before installation.
13 Remove The Screw Clamp (Metal Clamp)
• Bolt tightening specification of 2 Nm
• Currently installed. Refer to Electronic Parts Catalog.
14 Plastic Clamp
• Currently not installed (implementation not yet finalized, the screw clamp is currently always installed - item 13 => [ (Item 13) Remove The Screw Clamp (Metal Clamp) ] ) => [ Rear Heater Core ] Rear Heater Core and Electronic Parts Catalog.
15 Refrigerant Line Return Hose
• Incorporation of A/C system into cooling circuit, refer to => [ Incorporation of A/C System in Coolant Circuit ] Incorporation of A/C System in Coolant Circuit.
• The coolant lines and the rear heater core remain in the vehicle when removing the rear A/C unit (so that the coolant circuit does not need to be opened), refer to => [ Rear Heating and A/C Unit ] Rear Heating and A/C Unit.
• These coolant lines are connected to the coolant circuit via coolant hoses running in the center tunnel, refer to => [ Incorporation Of Rear Heating & A/C Unit Into Cooling and Refrigerant Circuit ] Incorporation Of Rear Heating & A/C Unit Into Cooling And Refrigerant Circuit.
• For these coolant lines to be removed, the rear A/C unit and the heat shield in the center tunnel must be removed.
• For these coolant lines to be removed with the rear A/C unit installed, the air duct to the rear fresh air blower (V80) => [ Rear Fresh Air Blower (V80) ] Description and Operation and the heat shield in the center tunnel must be removed..
• To remove the heat shield in the center tunnel, the exhaust system with the center muffler and the driveshaft must additionally be removed depending on the vehicle.
16 Refrigerant Line Supply Hose
• Incorporation of the A/C system in the coolant circuit, refer to => [ Incorporation of A/C System in Coolant Circuit ] Incorporation of A/C System in Coolant Circuit and => [ Incorporation Of Rear Heating & A/C Unit Into Cooling and Refrigerant Circuit ] Incorporation Of Rear Heating & A/C Unit Into Cooling And Refrigerant Circuit.
• The coolant lines and the rear heater core remain in the vehicle when removing the rear A/C unit (so that the coolant circuit does not need to be opened), refer to => [ Rear Heating and A/C Unit ] Rear Heating and A/C Unit.
• For this coolant line to be removed, certain preparations must be made - item 15 => [ (Item 15) Refrigerant Line Return Hose ].
17 Coolant Pipe Brackets
• Removed during removal of the A/C unit (so that the heater core can be removed), refer to => [ Rear Heating and A/C Unit ] Rear Heating and A/C Unit.
18 Air Guide Channel
• With recirculation doors and various levers.
• Do not disassemble further.
• Removing and installing, refer to => [ Rear Fresh Air Blower (V80) ] Description and Operation.
19 Rear Recirculation Door Motor (V421)
• Removal and installation, refer to => [ Rear Recirculation Door Motor (V421) ] Rear Recirculation Door Motor (V421).
• To rule out confusion, clearly label the wire routing, allocation and control motor for each installation location prior to disconnecting the connector or removing a control motor.
20 Cover For The Rear Recirculation Door Motor (V421)
• Disconnected from the air duct for removal of the rear recirculation door motor and reattached to the air duct via 2 bolts after installation of the rear recirculation door motor, refer to => [ Rear Recirculation Door Motor (V421) ] Rear Recirculation Door Motor (V421).