A/C Unit Air Intake Housing
A/C Unit Air Intake Housing
• From 01.2008, A/C units which have an additional connection for the glove compartment cooling are being installed. On vehicles without glove compartment cooling, this connection is sealed with a plug. Refer to => [ Glove Compartment Cooling to Air Intake Manifold Connection ] Glove Compartment Cooling to Air Intake Manifold Connection. Make sure that the correct right heater core housing and air intake housing are installed. Refer to Electronic Parts Catalog (ETKA).
• The following illustration shows the upper section of the air intake housing without a connection for the glove compartment cooling.
• From MY 12 (introduction depending on the version of the vehicle), a revised fresh air blower control module (J126) (and fresh air blower (V2) , Climatronic control module (J255) , evaporator, expansion valves, motors and A/C are being used. Refer to the Parts Catalog and the Vehicle diagnostic tester in "Guided Fault Finding". Read all the information regarding these components. Refer to => [ A/C Unit and Air Intake Housing Overview, Basis A/C System ] A/C Unit and Air Intake Housing Overview, Basis A/C System.
- Remove the air intake housing. Refer to => [ A/C Unit Air Intake Housing ] A/C Unit Air Intake Housing.
1 Foam Seal
• For sealing the fresh air intake duct to the vehicle; bonded to the air intake duct
2 Air Intake Duct
• With back pressure-, fresh air- and air recirculation door
• Do not disassemble further
• From the air intake housing, removing and installing, refer to => [ Air Intake Duct, Removing from Air Intake Housing ] Air Intake Duct, Removing From Air Intake Housing.
3 Cam Disk
• Actuated by two levers, the back pressure- and fresh air door
• Apply a small quantity of grease (G 000 150) to the cam plate guides as well as to the pins at the door levers. Refer to Electronic Parts Catalog (ETKA).
4 Back Pressure Door Motor (V71)
• Removing and installing, refer to => [ Air Flow Door Motor (V71) ] Air Flow Door Motor (V71).
5 Screw
6 Recirculation door motor (V113)
• Removing and installing, refer to => [ Recirculation Door Motor (V113) ] Recirculation Door Motor (V113).
7 Latch
• To lock the air intake housing to the A/C unit.
8 Upper Part Of The Air Intake Housing
• Do not dismantle
• Depending on the version of the Original part, the upper and lower sections are attached to each other by screws or the upper section is welded to the lower section.
• Current, as a replacement part, the air intake housing is delivered as a single part. Assemble both sections together and use the screws item 5 => [ (Item 5) Screw ] to connect the two sections together item 17 => [ (Item 17) Bolt Point ]. Refer to the Parts Catalog.
• If one of the retaining tabs, item 16 => [ (Item 16) Catches On The Upper Part Of The Air Intake Housing ] has broken off or if one of the welded points no longer holds, both housing parts can be bolted together with screws item 5 => [ (Item 5) Screw ] 5.
• Different versions (with and without a connection for glove compartment cooling), this illustration shows the version without the connection. Refer to Electronic Parts Catalog (ETKA).
9 Lower Part Of The Air Intake Housing
• Do not dismantle
• Depending on the version of the Original part, the upper and lower sections are attached to each other by screws or the upper section is welded to the lower section.
• Current, as a replacement part, the air intake housing is delivered as a single part. Assemble both sections together and use the screws, item 5 => [ (Item 5) Screw ] to connect the two sections together item 17=> [ (Item 17) Bolt Point ]. Refer to the Parts Catalog.
• If one of the retaining tabs, item 16 => [ (Item 16) Catches On The Upper Part Of The Air Intake Housing ] has broken off or if one of the welded points no longer holds, both housing parts can be bolted together with screws, item 5 => [ (Item 5) Screw ].
From MY 12, a new version is being used. Read all the information regarding this component. Refer to => [ A/C Unit and Air Intake Housing Overview, Basis A/C System ] A/C Unit and Air Intake Housing Overview, Basis A/C System.
10 Fresh Air Blower (V2)
• Removing and installing, refer to => [ Fresh Air Blower (V2) ] Service and Repair.
• Check using the Vehicle diagnostic tester in "Guided Fault Finding" function.
• Beginning August 2007, as a running change, the fresh air blower with an additional foam jacket is installed on the housing (as a noise insulation). Refer to => [ Fresh Air Blower (V2) ] Service and Repair and the Electronic Parts Catalog (ETKA).
• As a running change in MY 2009, a fresh air blower with a revised housing with an optimized motor and motor mount, is being used. The new fresh air blower does not have the foam jacket on the housing because the larger motor mount has a new insulation mat, item 14 => [ (Item 14) Insulation Mat ] and the Electronic Parts Catalog (ETKA).
• As a running change in MY 10, gasoline engines that can run on bioethanol (Flex Fuel Vehicles) were introduced, which currently have an auxiliary heater heating element (Z35). Refer to => [ Auxiliary Heater Heating Element (Z35), Testing ] Testing and Inspection.
• Currently an auxiliary air heater heating element is installed for vehicles with a high voltage system (hybrid vehicles) and a gasoline engine. Refer to => [ Auxiliary Heater Heating Element (Z35), Testing ] Testing and Inspection.
• The activation of the auxiliary heater heating element) occurs for vehicles with a gasoline engine from the Climatronic control module (J255) via the local Data bus (controlled using the same outlet and also using the fresh air blower control module (J126) ) on the auxiliary air heater control module (J604). Check the fresh air blower control module or the fresh air blower and also the auxiliary air heater control module when complaints arise for these vehicles. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".
• Make sure the auxiliary air heater heating element is working. Refer to => [ Auxiliary Heater Heating Element (Z35), Testing ] Testing and Inspection.
• From MY 12 (depending on the version of the vehicle) revised fresh air blower control module (J126) , fresh air blower, Climatronic control module (J255) and A/C units are being used. Be sure to use the correct version and allocation. Refer to the Parts Catalog and the Vehicle diagnostic tester in "Guided Fault Finding" function.
• The fresh air blower control module does not control the fresh air blower if the Climatronic control module allocation or adaptation to fresh air blower module (J126) (part number 8K0 820 521 or 8T0 820 521) is not according to the specification. There may not always be an entry in the DTC memory even though the activation of the fresh air blower is not OK. Make sure the Climatronic control module adaptation is correct. Refer to the Parts Catalog and to the Vehicle diagnostic tester in "Guided Fault Finding" function.
• From MY 12, a new version is being used. Read all the information regarding this component. Refer to => [ A/C Unit and Air Intake Housing Overview, Basis A/C System ] A/C Unit and Air Intake Housing Overview, Basis A/C System.
11 Fresh Air Blower Control Module (J126)
• Removing and installing, refer to => [ Fresh Air Blower Control Module (J126) ] Fresh Air Blower Control Module (J126).
• Check using the Vehicle diagnostic tester in "Guided Fault Finding" function.
• As a running change in MY 10, gasoline engines that can run on bioethanol (Flex Fuel Vehicles) were introduced, which currently have an auxiliary heater heating element (Z35). Refer to => [ Auxiliary Heater Heating Element (Z35), Testing ] Testing and Inspection.
• Currently an auxiliary air heater heating element is installed for vehicles with a high voltage system (hybrid vehicles) and a gasoline engine. Refer to => [ Auxiliary Heater Heating Element (Z35), Testing ] Testing and Inspection.
• The activation of the auxiliary heater heating element) occurs for vehicles with a gasoline engine from the Climatronic control module (J255) via the local Data bus (controlled using the same outlet and also using the fresh air blower control module (J126) ) on the auxiliary air heater control module (J604). Check the fresh air blower control module or the fresh air blower and also the auxiliary air heater control module when complaints arise for these vehicles. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".
• Make sure the auxiliary air heater heating element is working. Refer to => [ Auxiliary Heater Heating Element (Z35), Testing ] Testing and Inspection.
• From MY 12 (depending on the version of the vehicle) revised fresh air blower control module (J126) , fresh air blower, Climatronic control module (J255) and A/C units are being used. Be sure to use the correct version and allocation. Refer to the Parts Catalog and the Vehicle diagnostic tester in "Guided Fault Finding" function.
• From MY 12, a new version is being used. Read all the information regarding this component. Refer to => [ A/C Unit and Air Intake Housing Overview, Basis A/C System ] A/C Unit and Air Intake Housing Overview, Basis A/C System.
12 Dust and Pollen Filter
• Removing and installing, refer to => [ Dust and Pollen Filter ] Service and Repair.
• Follow the replacement intervals.
• Different versions with and without activated charcoal filter element. Refer to => [ Dust and Pollen Filter with Activated Charcoal Insert ] Description and Operation.
13 Cover For Dust and Pollen Filter
• Removing and installing, refer to => [ Dust and Pollen Filter ] Service and Repair.
14 Insulation Mat
• Removing and installing, refer to => [ Dust and Pollen Filter ] Service and Repair.
• Different versions, depending on the version of the fresh air blower (V2) , item 10 => [ (Item 10) ]. Refer to Electronic Parts Catalog (ETKA).
15 Screw Clips
16 Catches On The Upper Part Of The Air Intake Housing
17 Bolt Point