A/C Unit Components
A/C Unit Components
Observe notes for control and regulation of components in passenger compartment. Refer to=> [ A/C System Control and Regulation Components Inside Passenger Compartment ] A/C System Control and Regulation Components Inside Passenger Compartment.
• Air guide in air conditioner and in vehicle; refer to => [ Air Guide In Evaporator Housing ] Air Guide In Evaporator Housing and => [ Air Guide In Air Distribution Housing ] Air Guide In Air Distribution Housing.
• Heating & A/C unit, removing and installing; refer to => [ A/C Unit ] Removal and Replacement.
• The structure of the heater is basically the same as the A/C unit but there are differences because various components are not present => [ Heater Components ] Heater Components.
1 A/C Unit With Evaporator
• May only be removed when refrigerant circuit has been discharged; bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel.
• Heating and A/C unit, removing and installing, refer to => [ A/C Unit ] Removal and Replacement.
• Heating and A/C unit, disassembling and assembling; refer to => [ Disassembly and Assembly ] A/C Unit.
• Clean air conditioning system evaporator with Ultrasound A/C Cleaner (VAS 6189). Refer to=> [ Evaporator, Cleaning with Ultrasound A/C Cleaner ] Evaporator, Cleaning With Ultrasound A/C Cleaner.
2 Defroster Door Motor (V107)
• With Defroster Door Motor Position Sensor (G135).
• Lever color identification: blue.
• Removing and Installing, refer to=> [ Defroster Door Motor (V107) ] Defroster Door Motor (V107).
• This motor is fastened on the right on air distributor housing in vehicles with right-side steering.
3 Left Footwell Vent Temperature Sensor (G261)
• Removing and installing, refer to=> [ Left Footwell Vent Temperature Sensor (G261) ] Left Footwell Vent Temperature Sensor (G261).
4 Central Air Door Motor (V70)
• With Central Door Motor Position Sensor (G112).
• Removing and installing, refer to=> [ Central Air Door Motor (V70)/(V145) ] Central Air Door Motor (V70)/(V145).
• Depending on the version of the Climatronic control module (J255) , the Central Air Door Motor (V70) (with Central Door Motor Position Sensor (G112) ) may be designated as Front Air Distribution Motor (V145) (with Front Air Distribution Motor Position Sensor (G470) ) in On Board Diagnostic (OBD).
5 Auxiliary Air Heater Heating Element (Z35)
• Only intended for vehicles with Diesel engine.
6 Heater Core For Heater Unit
• Removing and installing, refer to => [ Heater Core ] Service and Repair.
7 Left Temperature Door Motor (V158)
• With Left Temperature Door Potentiometer/Actuator (G220).
• Lever color identification: white.
• Removing and installing, refer to => [ Left Temperature Door Motor (V158) ] Left Temperature Door Motor (V158).
• On the Audi TT, both positioning motors for left and right temperature doors are controlled via one characteristics curve, depending on the programmed end stops (only one temperature setting on the Climatronic control module (J255) is possible).
• Depending on the measured temperatures, the calculated sunlight intensity and setting on Climatronic control module, the calculated specified outflow temperature and therefore, the specified position of the positioning motor, may be different for the left and right side.
8 Back Pressure Door Motor (V71)
• With Back Pressure Door Motor Position Sensor (G113).
• Removing and installing, refer to => [ Air Flow Door Motor (V71), Function ] Air Flow Door Motor (V71), Function.
9 Recirculation Door Motor (V113)
• With Recirculation Door Motor Position Sensor (G143).
• Removing and installing, refer to => [ Recirculation Door Motor (V113) ] Recirculation Door Motor (V113).
10 Right Footwell Vent Temperature Sensor (G262)
• Removing and installing, refer to => [ Right Footwell Vent Temperature Sensor (G262) ] Right Footwell Vent Temperature Sensor (G262).
11 Intake Housing With Recirculating Air and Air Flow/Fresh Air Door
• Removing and installing, refer to => [ Air Intake Housing with Recirculating and Air Flow/Fresh Air Door ] Air Intake Housing With Recirculating and Air Flow/Fresh Air Door.
12 Temperature Sensor (Component Not Installed)
• Depending on version of air intake shroud, there may be an opening here for installing the temperature sensor, the temperature sensor pictured is not installed on the Audi TT, if there is an opening in the air intake shroud, it is seal with a grommet if necessary.
13 Fresh Air Blower Control Module (J126) and Fresh Air Blower (V2)
• Removing and installing, refer to => [ Fresh Air Blower Control Module (J126) and Fresh Air Blower (V2) ] Description and Operation.
• Different versions. At the start of production, a Fresh Air Blower was installed, with Fresh Air Blower Control Module cast on the blower (V2) (cannot be replaced individually). In model year 2007, Fresh Air Blower Control Module and Fresh Air Blower that are bolted together (each can be replaced separately) will be introduced as a running change. Refer to => [ Fresh Air Blower Control Module (J126) and Fresh Air Blower (V2) ] Description and Operation and Electronic Parts Catalog (ETKA).
• The Fresh Air Blower Control Module is installed in the Fresh Air Blower. Depending on the version, both of these components can be either replaced separately or only together.
• Checking, refer to Vehicle diagnosis, testing and information system (VAS5051B) in the "Guided Fault Finding".
14 Dust and Pollen Filter
• Removing and installing, refer to => [ Dust and Pollen Filter ] Service and Repair.
• Follow the replacement intervals.
• With activated charcoal insert, refer to => [ Dust and Pollen Filter with Activated Charcoal Insert ] Description and Operation.
15 Evaporator Vent Temperature Sensor (G263)
• Removing and installing, refer to => [ Evaporator Vent Temperature Sensor (G263) ] Evaporator Vent Temperature Sensor (G263).
16 Right Temperature Door Motor (V159)
• With Right Temperature Door Potentiometer/Actuator (G221).
• Removing and installing, refer to => [ Right Temperature Door Motor (V159) ] Right Temperature Door Motor (V159).
• On the Audi TT, both positioning motors for left and right temperature doors are controlled via one characteristics curve, depending on the programmed end stops (only one temperature setting on the Climatronic control module (J255) is possible).
• Depending on the measured temperatures, the calculated sunlight intensity and setting on Climatronic control module, the calculated specified outflow temperature and therefore, the specified position of the positioning motor, may be different for the left and right side.
17 Coolant Pipes To Heater Core
18 Grommet
• For sealing any holes in the coolant/refrigerant lines through the plenum chamber bulkhead into the engine compartment.
19 Condensation Water Drain Connection
• Condensation water drain valve, checking, removing and installing, refer to=> [ Condensation Water Drain Hose, Checking ] Testing and Inspection.
20 Expansion Valve
• Refrigerant lines, disconnecting and reconnecting, refer to=> [ Refrigerant Lines, Disconnecting and Connecting From Expansion Valve ] Refrigerant Lines, Disconnecting and Connecting From Expansion Valve.
• Removing and installing, refer to => [ Expansion Valve ] Expansion Valve.
• After switching off the A/C compressor in this vehicle, it may take a relatively long time for the pressure on the high pressure side to decrease. This is because the expansion valve is cold and the pressure on the low pressure side increases quickly after shutting the compressor off, then the expansion valve closes and the refrigerant flows slowly to the low pressure side.