Technical library for cars specialists

Handbook Air Conditioning Maintenance

710 pages, 27 makes, 302 notes
A4 Format (21 x 29,7 cm)

Handbook Air Conditioning Maintenance
Accessibility of the components
location of the components
in the engine compartment and in the cabin
Volumes and standards
Compressor oil and gas
Removal/installation processes
Filter tank
Cabin filter
Relais and fuses identification
Datas and conditions for
Pressure control

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Example
Publitest air conditioning

A/C control: manual
accessibility: **

under the bonnet



in the interior




 1020 computer of the engine management
 B24 interior fuses panel
 B25 fusesplate engine compartment
* C1 low pressure drain/refill end
 C13 condenser
 C15 evaporator
 C19 diode of clutch of the A/C compressor
* C2 high pressure drain/refill end
 C20 A/C computer
** C3 A/C compressor
** C4 filter tank
** C6 pressure reducer - gauged opening
** C7 pressure controller
 H5 motoventilator of the engine coolant circuit
 P25 relaysplate engine compartment


filter tank

periphery withdrawal



demounting the component



structure and managment

The drier-filter is also known as filter-tank.
When the liquefied gas returns to its gas form, it crosses the drier-filter which serves at once as cooling liquid tank, moisture extractor and filter.
There is often a sight feed glass to check the quality of the liquefied gas.
Structure and managment.

localization

Behind the rightside headlamp assembly.
The upper part of the filter-tank is in full view.

vehicle conditioning

Lift and secure the vehicle front (front/right wheel hanging).

general instruction

Disconnect the battery.
Empty the gas cooling circuit through the reload equipment.
Put caps on the ducts right after disconnection, to avoid any dust and moisture pollution.

periphery withdrawal

Disconnect :
  • A1 the cooling gas ducts of the filter-tank.
Lift and secure the vehicle front (front/right wheel hanging).
Remove :
  • The 4 screws attaching the wheel arch shield.
Fold :
  • The wheel arch cover.

demounting the component

Remove :
  • The 2 screws C4 attaching the drier-filter-tank.
  • The drier-filter-tank downwards.

reassembly

Proceed reversing the order of the removal.
Use :
  • A new filtering element.
Do not open the filter packaging until the last minute before installing it.

cooling gas

cooling gas R134a
quantity (grams): 740±15

A/C compressor

oil WSH-M1C231-B
quantity (ml): 200±7

fuses

interior fuses panel

localization



localization

F2 fuse of the A-C control unit 01/1997 -> : 10 amp.
F2 fuse of the A-C control unit 10/1997 -> : 7,5 amp.
F4 fuse of the A-C control unit 10 ams until 12/1996.
F6 fuse of the A-C control unit 10 ams until 09/1997.
F6 fuse of the A-C control unit 10/1997 -> : 7,5 amp.
F13 fuse of the A-C control unit.
F16 fuse of the interior fan.

fusesplate engine compartment

localization



localization

F28 fuse of the EFU control unit.
F29 fuse of the clutch relay for the A-C compressor.
F36 cartridge fuse of the motor-driven fans unit.

relaysplate engine compartment

localization



localization

R1 relay of the A-C compressor clutch.
R2 relay of the EFU control unit.
R3 A-C relay.
R4 relay of the engine coolant motor-driven fan high speed.
R5 relay of the engine coolant motor-driven fan low speed.

pressures/temperature

general instruction

Engine runing.
A-C runing.
Interior filter in full shape (if equipped).
A-C controls position.
Air distribution : front air vent.
Interior air distribution : recirculation.
Air temperature in the interior : maximum cold.
Ventilation speed : maxi.

particular instruction

Engine bonnet closed.
Hot engine (after one engagement of the motor-driven fan).
A-C runing for at least 15 minutes.
Doors and windows closed.

control

Connect the inspection equipment to the high and low pressure couplings.
Keep the engine speed at 1500 rpm.
Read the pressures as soon as stabilization occurs.
The readings should be in line with the reference values.

outside temperatureinput pressure of the compressor (LP) bar compressor output pressure (HP)
15,00 2,40±0,70 8,50±3,50
20,00 2,40±0,70 10,30±3,70
25,00 2,50±0,80 12,30±3,20
30,00 2,70±0,80 14,50±3,50
35,00 3,00±1,00 16,90±3,10