ajsellors
A2OC Donor
Introduction:
Recently I have needed to do work on the climate unit in my A2.
As I found certain information for right hand drive cars hard to find, I purchased the complete interior climate unit from a breakers. This allowed me to learn how it is put together, a task not possible with the dash and other interior components in the way in a car.
Below I will share the knowledge gained so that it may be of help to others.
Description:
The climate unit in the A2 is made out of a modular construction. The centre module, which contains the heating and cooling (with air conditioning) elements is almost identical for both RHD and LHD models. The air blower fan and pollen filter however are always located on the passenger side.
This picture shows the climate unit as would be seen from inside the car. The module is from an early car with digital control and air conditioning. The blower fan motor has previously been removed, but otherwise it is complete.
The digital controls monitor the air temperature entering in the inlet and also the air emitted from each of the outlets. The air temperature sensors can be seen by the grey plastic connector and the green and yellow wires.
The climate unit has 6 movable flaps controlled by 4 motors with built in positioning potentiometers.
The pollen filter is located between the blower fan and the main central section. This is changed from inside the car through an opening flap below the glovebox on the passenger side. Unlike some other models which fit the filter on the external fresh air intake, the air in the A2 is always filtered, even in recirculation mode.
The lower module of the central section contains the heating and cooling elements. The engine cooling system driven heater element is fitted above the air conditioning cooling element. The electric auxiliary heater is also fitted here where applicable.
This picture shows a view not normally seen as this is the side facing the engine.
The fresh air is drawn from the opening slats in the top of the bonnet.
The higher flange attaches to pipes running to the engine’s cooling system to drive the heating element. The lower metal pipes contain the air conditioning refrigerant.
The rubber hose allows any water condensed off the cooling element to run away. This is deposited below the car on the ground.
The right hand (RHD driver’s) side of the central module contains the V70 central flap positioning motor and the G263 evaporator outlet temperature sensor. The latter is the major difference on the central module between LHD and RHD cars in that the G263 sensor is always positioned on the driver’s side. The other flap motors attached to the side of the central module are always in the same position.
The outlet temperature probe can be seen in the driver’s footwell airflow outlet. It is the green flat circuit board.
The V70 central flap motor is fixed by a bracket held by two pins which fit into holes and a single clip. The one motor drives the position of both the flap which controls the front and rear footwell airflow and also the vents on the front of the dash.
The motor drives the flaps with linkages that run in shaped grooves on the motor’s drive wheel. The shape of the grooves allow the alternate and combined opening and closing of the two flaps with one motor.
On the RHD car, the G263 sensor is above and in front of the V70 motor.
The sensor itself can be removed easily by pulling out. Gaining access to pull is the hard part!
The V107 windscreen demister and V68 temperature control motors are located on the left (RHD passenger side) of the central module.
Both motors are held in a single bracket with two pins which fit into holes and two clips.
Recently I have needed to do work on the climate unit in my A2.
As I found certain information for right hand drive cars hard to find, I purchased the complete interior climate unit from a breakers. This allowed me to learn how it is put together, a task not possible with the dash and other interior components in the way in a car.
Below I will share the knowledge gained so that it may be of help to others.
Description:
The climate unit in the A2 is made out of a modular construction. The centre module, which contains the heating and cooling (with air conditioning) elements is almost identical for both RHD and LHD models. The air blower fan and pollen filter however are always located on the passenger side.
This picture shows the climate unit as would be seen from inside the car. The module is from an early car with digital control and air conditioning. The blower fan motor has previously been removed, but otherwise it is complete.
The digital controls monitor the air temperature entering in the inlet and also the air emitted from each of the outlets. The air temperature sensors can be seen by the grey plastic connector and the green and yellow wires.
The climate unit has 6 movable flaps controlled by 4 motors with built in positioning potentiometers.
The pollen filter is located between the blower fan and the main central section. This is changed from inside the car through an opening flap below the glovebox on the passenger side. Unlike some other models which fit the filter on the external fresh air intake, the air in the A2 is always filtered, even in recirculation mode.
The lower module of the central section contains the heating and cooling elements. The engine cooling system driven heater element is fitted above the air conditioning cooling element. The electric auxiliary heater is also fitted here where applicable.
This picture shows a view not normally seen as this is the side facing the engine.
The fresh air is drawn from the opening slats in the top of the bonnet.
The higher flange attaches to pipes running to the engine’s cooling system to drive the heating element. The lower metal pipes contain the air conditioning refrigerant.
The rubber hose allows any water condensed off the cooling element to run away. This is deposited below the car on the ground.
The right hand (RHD driver’s) side of the central module contains the V70 central flap positioning motor and the G263 evaporator outlet temperature sensor. The latter is the major difference on the central module between LHD and RHD cars in that the G263 sensor is always positioned on the driver’s side. The other flap motors attached to the side of the central module are always in the same position.
The outlet temperature probe can be seen in the driver’s footwell airflow outlet. It is the green flat circuit board.
The V70 central flap motor is fixed by a bracket held by two pins which fit into holes and a single clip. The one motor drives the position of both the flap which controls the front and rear footwell airflow and also the vents on the front of the dash.
The motor drives the flaps with linkages that run in shaped grooves on the motor’s drive wheel. The shape of the grooves allow the alternate and combined opening and closing of the two flaps with one motor.
On the RHD car, the G263 sensor is above and in front of the V70 motor.
The sensor itself can be removed easily by pulling out. Gaining access to pull is the hard part!
The V107 windscreen demister and V68 temperature control motors are located on the left (RHD passenger side) of the central module.
Both motors are held in a single bracket with two pins which fit into holes and two clips.