Air Routing In Air Intake Housing and A/C Unit
Air Routing in Air Intake Housing and A/C Unit
• This illustration shows the "Comfort" A/C system; some components are not part of the "Basis" A/C system.
• The activation of the different doors in the vents and the temperature doors differs between the "Basis" and "Comfort" A/C systems
• In order to show the air flow in the air intake house and in the A/C unit, both these components are shown cut open through the "A - A" and "B - B" lines.
• 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.
• This illustration shows the A/C without a connection for glove compartment cooling. On vehicles with glove compartment cooling, the cooled air comes directly past the evaporator into the glove compartment item 8 => [ (Item 8) Evaporator ].
1 Air Conditioner Unit
• There are different versions depending on the A/C system installed ("Comfort" and "Basis"). Refer to => [ A/C Unit ] Overhaul and to the Parts Catalog.
2 Air Intake Housing
3 Fresh Air Intake
• The air is extracted out of the plenum chamber. Refer to => [ Fresh Air Intake ] Fresh Air Intake.
4 Removing Air From The Passenger Compartment (In Recirculating Air Mode)
• The air is drawn out of the front passenger footwell when the air recirculation flap under the glove compartment is open.
• In this illustration, the air recirculation door is shown in the "closed" position.
5 Fresh Air Blower (V2)
6 Dust and Pollen Filter
• There are different versions of the dust and pollen filter (without and with filter insert with activated charcoal). Refer to => [ Dust and Pollen Filter with Activated Charcoal Insert ] Description and Operation and the Parts Catalog.
7 Air Intake Housing Lower Section (With Installation Components)
• This illustration shows the air intake housing sectioned by the "A - A " line.
8 Evaporator
9 Lower Part Of The A/C Unit (With Installation Components)
• This illustration shows the air intake housing sectioned by the "A - A " line.
10 Temperature Door For The Front Right Vent
• In this illustration, the temperature door is shown in the "heat" position.
• On the "Comfort" A/C system, the front right and left temperature doors are each actuated by a control motor. Both temperature doors for the rear vents are connected to each other by a connector rod; they are actuated by another control motor. Refer to => [ A/C Unit ] Overhaul.
• On the "Basis" A/C system, one shaft connects the front temperature flaps and the temperature flap for the rear footwell vent to each other. The right and left temperature flap shafts are connected to each other by a connector rod; they are actuated by one motor. Refer to => [ A/C Unit ] Overhaul.
• Temperature doors in the left and right heater core housing. Refer to => [ Heater Core Housing Temperature Doors ] Heater Core Housing Temperature Doors.
11 Right Rear Vent Temperature Door
• In this illustration, the temperature door is shown in the "cooling" position.
• Instructions for actuating the temperature doors, item 10 => [ (Item 10) Temperature Door For The Front Right Vent ].
12 Heater Core For Heater Unit
• Heater core with the A/C installed, removing and installing, refer to => [ Heater Core/Housings ] Heater Core/Housings.
• Covered with different foam seals, depending on the ("Comfort" and "Basis" A/C systems). Refer to => [ Heater Core/Housings ] Heater Core/Housings.
13 Auxiliary Air Heater Heating Element (Z35) / Honey Comb
The auxiliary heater heating element is installed on vehicles with certain gasoline engines. Refer to => [ Auxiliary Heater Heating Element (Z35), Testing ] Testing and Inspection.
Vehicles with gasoline engine, without auxiliary heater heating element have a honey comb installed in the as a place holder (this assures that current conditions in the A/C with and without auxiliary heater heating element are the same).
• Covered with different foam seals, depending on the ("Comfort" and "Basis" A/C systems). Refer to => [ Auxiliary Air Heater Heating Element (Z35)/Honey Comb ] Service and Repair.
• In MY 2009, as a running change, a new version of the auxiliary heater heating element is being installed (the heating element is a bit more narrow); be sure to use the correct version and note the allocation. Refer to Electronic Parts Catalog (ETKA).
• As a running change from MY 10, gasoline engines that can run on bioethanol (Flex Fuel Vehicles) were introduced, which currently have an auxiliary heater heating element. Refer to => [ Auxiliary Heater Heating Element (Z35), Testing ] Testing and Inspection.
• Currently an auxiliary heater heating element is installed for vehicles with a high voltage system (hybrid vehicles) and a gasoline engine => [ Auxiliary Heater Heating Element (Z35), Testing ] Testing and Inspection.
14 Separator Wall
• Present only on vehicles equipped with the "Comfort" A/C system (not on the "Basis" A/C system; here only one temperature setting for all vents is possible).
• On the "Comfort" version, the air guide to the left and right vents separate and responsible for the differing air temperatures coming out of the vents. The temperature of the air coming out depends on the position of the respective temperature doors item 10 => [ (Item 10) Temperature Door For The Front Right Vent ].
15 Separator Wall
• Present only on vehicles equipped with the "Comfort" A/C system (not on the "Basis" A/C system; here only one temperature setting for all vents is possible).
• On the "Comfort" A/C system, the air flow to the front and rear vents are separated from each other; the requirement for different front and rear air temperatures (depends on the setting of each temperature door, item 10 => [ (Item 10) Temperature Door For The Front Right Vent ] ).
16 Temperature Door For The Rear Left Vent
• In this illustration, the temperature door is shown in the "heat" position.
• Instructions for actuating the temperature doors item 10 => [ (Item 10) Temperature Door For The Front Right Vent ].
17 Temperature Door For The Front Left Vent
• In this illustration, the temperature door is shown in the "cooling" position.
• Instructions for actuating the temperature doors item 10=> [ (Item 10) Temperature Door For The Front Right Vent ].