2010 ASTON MARTIN V8 VANTAGE climate control

Air Conditioning (A/C) System (12.03)
Climate Control (12.00)
May 2007 Workshop Manual 12-3-1
Climate Control (12.00)
Air Conditioning (A /C) System (12.03)
 


 



Item
1. Condenser
2. Trinary switch
3. Compressor assembly
4. High-side charge port
5. Receiver drier 6. Low-side charge
7. Blower Unit
8. Switch, A/C Cut-Off
9. Expansion valve
10. A/C Unit

Air Conditioning (A/C) System (12.03)
Climate Control (12.00)
12-3-2 Workshop Manual May 2007
Major Components
Compressor
• Engine mounted, driven by the accessory drive belt
• Variable displacement type
• High-pressure relief valve, to avoid system over-pressure
• ECU controlled clutch energised via a relay
Receiver drier
• Vertically mounted on the right-hand side of the engine bay
• The high-side charge port is installed to the high side entry pipe to the receiver drier
Condenser
• Multi-pass fin-over-tube type, mounted in front of the engine cooling pack and directly to the radiator
Trinary switch
Located in the compressor discharge pipe
• Provides a signal, via the A/C module, to the PCM, to disengage the compressor clutch should the refrigerant
pressure be less than 2 bar or greater than 30 bar
• Provides a hard-wired signal to the PCM, to switch the cooling fans to HIGH speed at 22 bar rising pressure and
to LOW speed at 17,5 bar falling pressure
• Provides a hard-wired signal to the PCM, to switch the radiator cooling fans to LOW speed at 12 bar rising
pressure and to switch the fans OFF at 8 bar falling
pressure
Expansion Valve
The expansion valve is located on the outside of the A/C unit
and comprises of a diaphragm, connected by a capillary
tube to a temperature sensing bulb, which regulates the
valve according to temperature variations at the evaporator
outlet pipe. This component is not serviceable.
A/C Unit

([SDQVLRQ9DOYH





Air Conditioning (A/C) System (12.03)
Climate Control (12.00)
May 2007 Workshop Manual 12-3-3
The A/C unit houses the evaporator, heater matrix and air
flow flaps.
The unit also incorporates two servo motor operated air
distribution flaps.
1. Regulates airflow to the cabin vents.
2. Regulates airflow to the defrost / demist air ducting.
When the cabin air flap is open, air is ducted to the cabin via
face and foot level air vents.
Condensate (water) which forms on the evaporator fins is
drained out of the unit case through a drain hose, located at
underneath / rear of the evaporator.
Refrigerant System

Warning
Do not perform a pressure test or leak test for R-134a service equipment and or vehicle A/C using
compressed air. Some mixtures of air and R-134a have
been shown to be combustible at elevated pressures.
These mixtures, if ignited, ma y cause injury or property
damage. Additional health and safety information may
be obtained from refrigerant manufacturers.
Warning
Do not allow refrigerant to leak near a fire or any kind of heat. A poisonous gas may be generated if
refrigerant gas contacts fire or heat such as from
cigarettes and heaters. When carrying out any
operation that can cause refr igerant leakage, extinguish
or remove the above mentioned heat sources and
maintain adequate ventilation.
Warning
Handling liquid refrigerant is dangerous. A drop of
refrigerant on the skin can result in localized frostbite. When handling refrigerant, wear gloves and safety
goggles. If refrigerant sp lashes into the eyes,
immediately wash them with clean water and consult a doctor.
Warning
Avoid breathing A/C refrigerant or lubricant vapor.
Exposure may irritate eyes, nose and throat. Also, due
to environmental concerns , Aston Martin recommend
the use of a recovery/recycling/recharging unit when
draining R-134a from the A/C system. If accidental A/C
system discharge occurs, vent ilate the work area before
resuming service.

Air Conditioning (A/C) System (12.03)
Climate Control (12.00)
12-3-4 Workshop Manual May 2007
Storing Refrigerant
Handling Insufficient Refrigerant Level
Handling Compressor Oil
Refrigeration Cycle
Operation
1. The Compressor (1) dr aws low pressure, low
temperature, refrigerant vapour from the evaporator (5)
and compresses it, raising th e refrigerant pressure and
temperature.
2. This high pressure, hot, refrigerant vapour enters the condenser (2), where it is cooled by the flow of ambient
air and changes state into a cooler, high pressure liquid.
3. From the condenser, the liqu id passes into the receiver
drier (3) which has three functions:
• Removes moisture from the refrigerant using a desiccant
• Filters the refrigerant to remove system contaminants
• Stores the refrigerant to cope with varying system refrigerant demands
4. The filtered liquid refrigerant, still at high pressure, then enters the expansion valve (4). Here it passes through a
controlled orifice and emerges as an atomised liquid
spray. This has the effect of reducing the refrigerant
pressure and temperature. The cold refrigerant spray
now flows into the evaporator (5).
5. As refrigerant passes through the evaporator core, it cools the incoming airflow. Heat is absorbed by the
refrigerant, during this process and it once again changes
state, from an atomised cool liquid into a vapour. The
refrigerant vapour then returns to the compressor for the
cycle to be repeated.
An automatic safety valve is incorporated in the compressor,
which will open if the system pressure rises above 41 bar.
The valve will reseat when the pressure drops below 27,6
bar. When the safety valve is open, the compressor will 'free
Warning
The refrigerant container is highly pressurized. If it is subjected to high heat, it could explode, scattering metal fragments and liquid refrigerant that can
seriously injure personnel. Store refrigerant at
temperatures below 40
oC (104 oF).
Caution
If an insufficient refrigerant level is detected while
troubleshooting, do not char ge (add) the refrigerant.
Because an accurate amount of refrigerant cannot be
determined from the pressure indicated on the
recovery / recycling / rechar ging unit, never charge the
refrigerant.
Caution
If there is too much or to o little refrigerant from the
refilling, there may be secondary problems such as
damage to the refrigerant cycl e parts, or a decrease of
cooling performance. Therefore, if it is determined that the refrigerant level is insufficient, completely remove refrigerant from the refriger ant cycle and refill with
refrigerant to the specified amount.
Caution
Use only ND8 compressor oil for this vehicle. Using a PAG oil other than DENSO OIL8 compressor oil will damage the A/C compressor.
Caution
Do not spill the ND8 compressor oil on the vehicle. A drop of compressor oil on the vehicle surface can
damage the paint work. If oil gets on the vehicle, wipe it off immediately.
Caution
ND8 compressor oil has a high moisture absorption
efficiency. If moisture mixe s with the compressor oil,
the refrigerant system could be damaged. Ensure caps
are installed immediately afte r using the compressor oil
or removing refrigerant system parts to prevent moisture absorption.

 
 


+LJK3UHVVXUH+RW9DSRXU
+LJK3UHVVXUH&RRO/LTXLG
/RZ3UHVVXUH&ROG9DSRXU
/RZ3UHVVXUH+RW9DSRXU
&RPSUHVVRU
&RQGHQVHU
5HFHLYHU'ULHU
([SDQVLRQ9DOYH
(YDSRUDWRU
7ULQDU\6ZLWFK

Air Conditioning (A/C) System (12.03)
Climate Control (12.00)
May 2007 Workshop Manual 12-3-5
wheel' and the excess pressure will be dissipated through the
expansion valve. When the pressure drops below 27.6 bar,
the safety valve will close again and the compressor will be
operative.
The terms ‘high’ and ‘low’ pressure (or side) refer to the
pressure differential between the compressor and expansion
valve ports. This differential is critical to system fault
diagnosis and efficiency checks.
The high side starts at the compressor and includes the
trinary switch, condenser, receiver drier and expansion
valve.
The low side starts at the expansion valve outlet and includes
the evaporator and all connectio ns back to the compressor.
The trinary switch (6) monitors system pressure between the
compressor and condenser. If the pressure rises above 30
bar or falls below 2 bar the compressor clutch is
de-energised to prevent damage to system components.
Specifications
Refrigerant and Lubricant
Capacities
Torque Figures
Refrigerant R-134a
Compressor Lubricant ND8
Refrigerant charge Weight 750g (26.5oz.)
Compressor Lubricant Sealed volume (approx.
quantity) 150 cc (pre-charged)
Nm.
AC unit Mounitng 20-25
Compressor Mounting 23-27
A/C pipes to condenser 8-10







Air Conditioning (A/C) System (12.03)
Climate Control (12.00)
12-3-6 Workshop Manual May 2007
Diagnostics
Electrical Connectors
A/C Module (C0792)



A/C Module (C0791)
PinSpecification
1 Air flow mode actuator (output)
2 Temperature actuator (output)
3Blank
4Blank
5Blank
6 A/C On (A/C pressure sensor)
7Blank
8 Recirculation actuator (output)
9Blank
10 Blank
11 Temperature level (RHD)
12 Blower speed regulator (Output)
13 Air flow mode actuator (output)
14 Temperature actuator (output)
15 Blank
16 Output
17 HAVAC ECU (input)
18 Blank
19 Blower relay (engine bay fusebox)
20 Recirculation actuator (output)
21 Blank
22 blank
23 Temperature level (LHD)
24 Blower speed regulator input)




Air Conditioning (A/C) System (12.03)
Climate Control (12.00)
May 2007 Workshop Manual 12-3-7
DTC Inspection
Using WDS
1. Connect the WDS to the body diagnostic socket (Refer to ’A ppendix & Glossary ’, page 20-1-2).
2. Select ‘Air-Con’ from the menu.
3. Read the fault codes from the WDS screen.
Single Fault Codes
Code Description Possible Cause
02 Solar radiation sensor system inspection
Present fault. 1. Solar radiation sensor fault.
2. Open or short circuit in the wiring harness between the A/C
module and the solar radiation sensor.
Code Description Possible Cause
06 Cabin temperature sensor system
inspection. 1. Cabin temperature sensor fault
2. Open or short circuit in wiring
harness between A/C module and
cabin temperature sensor
Code Description Possible Cause
07 Cabin temperature sensor system
inspection. 1. Cabin temperature sensor fault
2. Open or short circuit in wiring harness between A/C module and
cabin temperature sensor
Code Description Possible Cause
10 Evaporator temperature sensor system
inspection 1. Evaporator temperature sensor fault
2. Open or short circuit in the wiring harness between the A/C
module and the evaporator temperature sensor
Code Description Possible Cause
12 Ambient temperature sensor system
inspection 1. Ambient temperature sensor fault
2. Open or short circuit in the wiring harness between the A/C
module and the ambient temperature sensor
Code Description Possible Cause
14 ECT sensor system inspection 1. ECT fault
2. A/C module fault
3. PCM fault
4. Open or short circuit in the wiring harnesses between the A/C
module, the ECT sensor, and the PCM
Code Description Possible Cause
18 Air mix actuator (potentiometer) system
inspection 1. Air mix actuator fault
2. Open circuit in the wiring harness between the A/C module and
the air mix actuator
3. Short circuit in the wiring harness between the A/C module (C0792-12) and the air mix actuator (terminal 5)
21 Airflow mode actuator (potentiometer)
system inspection 1. Airflow mode actuator fault
2. Open circuit in wiring harness between A/C module and airflow
mode actuator
3. Short circuit in wiring harnes s between A/C module (C0792-4)
and airflow mode actuator (terminal 5)
Code Description Possible Cause
11 Evaporator temperature sensor system
inspection. 1. Evaporator temperature sensor fault
2. Open or short circuit in wiring harness between A/C module and
evaporator temperature sensor

Air Conditioning (A/C) System (12.03)
Climate Control (12.00)
12-3-8 Workshop Manual May 2007
Multiple Fault Codes
Code Description Possible Cause
13 Ambient temperature sensor system
inspection. 1. Ambient temperature sensor fault
2. Open or short circuit in the wiring harness between the A/C
module and the ambient temperature sensor
Code Description Possible Cause
15 ECT sensor system inspection.
Past fault. 1. ECT fault
2. Open or short circuit in the wiring harness between the A/C
module and the ECT sensor
Code Description Possible Cause
19 Air mix actuator (potentiometer) system
inspection.
Past fault. 1. Air mix actuator fault
2. Open circuit in the wiring harness between the A/C module and
the air mix actuator
3. Short circuit in th e wiring harness between the A/C module
(C0792-12) and air mix actuator (C2130-5)
22 Airflow mode actuator (potentiometer)
system inspection.
Past fault. 1. Airflow mode actuator fault
2. Open circuit in wiring harnes
s between A/C module and airflow
mode actuator
3. Short circuit in th e wiring harness between the A/C module
(C0792-4) and the air mix actuator (C2130-5)
Code Description Possible Cause
58 Air mix actuator (motor lock) system
inspection
Past fault. 1. Air mix actuator fault
2. A/C unit (air mix link and air mix crank) fault
3. Open or short circuit in the wiring harness between the A/C
module and the air mix actuator
Code Description Possible Cause
59 Airflow mode actuator (motor lock) system
inspection.
Past fault. 1. Airflow mode actuator fault
2. A/C unit (airflow mode link and airflow mode crank) fault
3. Open or short circuit in the wiring harness between the A/C
module and the airflow mode actuator
Code Description Possible Cause
06 / 10 /
12 / 18 /
21 A/C module (+5 V power supply or sensor
ground) system inspection.
1. Open circuit in wiring harnesses between A/C module and
each temperature sensor, air mix actuator, or airflow mode
actuator
Code Description Possible Cause
02 / 18 /
21 A/C module (5 V power supply) system
inspection. 1. Open or short circuit in the wiring harnesses between the A/C
module and solar radiation sensor, air mix actuator, or airflow
mode actuator
Code Description Possible Cause
07 / 11 /
13 / 19 /
22 A/C module (5 V power supply or sensor
ground) system inspection.
1. Open circuit in the wiring harnesses between the A/C module
and each temperature sensor, air mix actuator, or airflow mode
actuator
Code Description Possible Cause
19 / 22 A/C module (5 V power supply) system
inspection. • Open or short circuit in wiri
ng harnesses between the A/C
module and the solar radiation sensor, air mix actuator, or
airflow mode actuator