Workshop Manuals Factory service & repair Aston Martin
Aston Martin DB9 Factory Workshop Manual (Issue 2, 2005)13 · 12 Climate control
13 · Heating & A/C

Major Components

Make
Aston Martin
Model
DB9 Factory Workshop Manual
Year
Issue 2, 2005
Section
Air Conditioning (A/C) System › Major Components
12 Climate controlMajor Components
Diagram of the Air Conditioning system components including condenser, compressor assembly, receiver drier, trinary switch, charge ports, blower unit, A/C unit, and expansion valve
ItemDescriptionItemDescription
1.Condenser6.Low-side charge.
2.Trinary switch7.Blower Unit.
3.Compressor assembly8.Switch, A/C Cut-Off.
4.High-side charge port9.Expansion valve.
5.Receiver drier.10.A/C Unit.

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

Parts & tools for this job For 2005 Aston Martin DB9

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