Get Air Conditioning Guide for Citroen C6 4 Door First Generation (2005-2012)

AIR CONDITIONING R 134.a (HFC)

Compressor

Oil quantity

cc

Refrigerant

Refill

Vehicle

C6

Engine version

Date

Variable

Oil

reference

(

25 gr)

capacity

ES9A

625

525

12/05 ➔

SD 7 C16

135

SP 10

DT17BTED4

203

SPECIAL FEATURES: AIR CONDITIONING SYSTEM

Compressor

Condenser

The variable capacity air conditioning compressor has external control.

The internal pneumatic valve is replaced by an external electrovalve.

The condenser has a cylinder incorporating the function of aircon fluid

reservoir and with integral filtering cartridge.

NOTE: The filtering cartridge is not interchangeable.

204

SPECIAL FEATURES: AIR CONDITIONING SYSTEM

Tightening

Requirements for fitting the inlet and outlet brackets:

- Aircon compressor.

- Aircon condenser.

- Aircon pressure reducer valve.

IMPERATIVE: Assembly requirement: the bracket(s) «f» must be against

their interface(s) before the nut(s) are tightened.

IMPERATIVE: Respect the tightening torques.

C5HP1CWC

205

SPECIAL FEATURES: AIR CONDITIONING SYSTEM (R 134.a)

Pollen filter

The pollen filter is located on the driver's side under the dashboard to the

right of the steering column.

IMPERATIVE: Respect the safety and cleanliness requirements.

Removing.

Remove the trim (1) under the dashboard (driver's side).

Release the tab at "b".

C5FP0S1C

Tilt, lift and remove the cover (2).

Remove the pollen filter (3).

NOTE: If the tab "b" is damaged, position a screw for soft materials at "a".

Refitting.

Refit the various components in reverse order to removal.

C5HP1BDD

206

SPECIAL FEATURES: AIR CONDITIONING SYSTEM (R 134.a)

Compressor lubricant

ESSENTIAL: The compressor lubricant is extremely hygroscopic; always use FRESH oil.

Checking the compressor oil level

There are three specific cases:

- 1) Repairs to a system without leaks.

- 2) Slow leak.

- 3) Fast leak.

1) Repairing a system without leaks.

a) - Using draining/recovery equipment not fitted with an oil decanter.

- Drain the system as slowly as possible via the LOW PRESSURE valve, so as not to lose any oil.

- No more oil should be added when filling the system with R 134.a fluid.

b) - Using draining/filling equipment fitted with an oil decanter.

- Drain the R 134.a fluid from the system in accordance with the instructions in the equipment handbook.

- Measure the amount of oil recovered.

- Add the same amount of NEW oil when filling the system with R 134.a fluid.

c) - Replacing a compressor.

- Remove the old compressor, drain it and measure the oil quantity.

- Drain the new compressor (supplied full), so that the same amount of NEW oil is left in the compressor as was in the old compressor.

- No more oil should be added when filling the system with R 134.a fluid.

207

SPECIAL FEATURES: AIR CONDITIONING SYSTEM (R 134.a)

Checking the compressor oil level (continued)

2) Slow leak.

Slow leaks do not lead to oil loss, therefore the same procedure should be followed as if there was no leak at all.

3) Fast leak.

This type of leak causes both oil loss as well as allowing air to enter the system.

It is therefore necessary to:

- Replace the dryer.

- Drain as much oil as possible (when replacing the faulty component).

Either before or during filling of the system with R 134.a fluid, introduce 80 cc of NEW oil into the system.

If changing one of the following components, add as below:

- A drying bottle

: 15 cc of compressor oil.

: 20 cc of compressor oil.

: 5 cc of compressor oil.

: 15 cc of compressor oil.

- A condenser or an evaporator

- A high pressure or low pressure pipe

- A drying cartridge

208

CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM

Equipment: EXXOTest

Tooling (tools and Equipment flash).

Equipment:VALEO

Tooling.

Exxoclim

: 2.4.2-1.

Clim test 2

Method of use

: 4372-T.

Method of use

: See instructions.

E5AP2N5D

E5AP2N4D

209

CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM

Testing procedure.

Checking.

Position the equipment - Exxoclim or Clim test 2 - (see instructions).

Preliminary operations.

Close all the front air vents.

Start the engine.

Open the front air vent.

Activate the «air conditioning» control.

Position the air distribution control to «frontal flow».

Activate the «air recirculation» control.

Positions of the air conditioning controls:

- Temperature control on maximum cold (LH and RH).

- Blower control in maximum speed position.

Let the air conditioning operate for 5 minutes.

210

CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM

Reminder (for information)

Under-cooling.

The under-cooling represents the difference between the condensation temperature and the aircon fluid temperature at the aircon condenser outlet.

The under-cooling gives the quantity of aircon fluid (in the liquid state) in the air conditioning circuit.

Values for under-cooling (SR).

Values

SR < 2°C

Origins

Solutions

Lack of aircon fluid in the aircon condenser

Correct quantity

Add some aircon fluid

2°C < SR <4°C

4°C < SR < 10°C/12°C

SR > 10°C/12°C

SR > 15°C

Excess aircon fluid in the aircon condenser

Remove some aircon fluid

Over-heating.

The over-heating represents the difference between the aircon fluid temperature at the evaporator outlet and the evaporation temperature.

The over-heating gives the quantity of aircon fluid (in the liquid state) in the air conditioning circuit

Values for over-heating (SC).

Values

2° < SC < 15°C

SC > 15°C

SC < 2°C

Origins

Solutions

Correct quantity

Lack of aircon fluid in the cooling circuit

Excess aircon fluid in the cooling circuit

Add some aircon fluid

Remove some aircon fluid

Blown air temperature.

The blown air temperature should be between 2°C and 10°C.

211

CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM

Aircon circuit diagnosis table (for information)

Principal problem

Symptom

Possible causes

Aircon compressor clutch

Lack of aircon fluid in the aircon circuit

Aircon pressostat

The clutch of the aircon compressor does not

engage, or disengages suddenly

Aircon evaporator sensor

Electrical circuit (wiring, fuses, etc.)

Auxiliaries drive belt

The aircon compressor does not turn

or stops suddenly

Aircon compressor

The clutch of the aircon compressor remains

engaged and stops suddenly

Filtering and drying cartridge

Aircon pressure reducer

Leak of aircon fluid

Aircon compressor clutch

212

CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM

Aircon circuit diagnosis table (for information)

Principal problem

Symptom

Possible causes

Incorrect adjustment of the aircon compressor

clutch

The clutch of the aircon compressor

remains engaged

Aircon fluid quantity

Aircon compressor defective

Lack of aircon fluid in the aircon circuit

Aircon compressor valves defective

Aircon compressor clutch

The aircon compressor makes an abnormal

noise

The clutch of the aircon compressor

remains engaged and slips

Auxiliaries drive belt

213

CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM

Aircon circuit diagnosis table (for information)

Principal problem

Symptom

Possible causes

Aircon pressure reducer defective

Duct clogged

Low pressure and high pressure too high

Low pressure too high and high pressure too low Aircon compressor seal defective

Aircon evaporator sensor defective

Low pressure too low and high pressure too high Aircon pressure reducer jammed

too high

Abnormal levels of pressure

Filtering and drying cartridge obstructed

Duct clogged

Aircon pressure reducer jammed

Low pressure and high pressure too low

Lack of aircon fluid in the aircon circuit

Aircon compressor defective

214

CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM

Aircon circuit diagnosis table (for information)

Principal problem

Symptom

Possible causes

Low pressure normal and high pressure too high Presence of air in the aircon circuit

Aircon pressostat defective

Low pressure normal and high pressure too low

Evaporator sensor defective

Low pressure too high and high pressure normal Aircon pressure reducer jammed open

Filtering and drying cartridge saturated or

Abnormal levels of pressure

Low pressure too low and high pressure normal

clogged

Aircon pressure reducer iced up

Lack of aircon fluid

Under cooling too weak

Air conditioning operating in

back-up mode

Excess aircon fluid

Under cooling excessive

Presence of air in the aircon circuit

Filtering and drying cartridge clogged

NOTE: In all cases, measure the excessive heating (SC) and the blow air temperature.

215

AIR CONDITIONING SYSTEM R.134.a

Engine: ES9A

Tightening torques (m.daN).

(1) High pressure valve

(2) Low pressure valve

(3) Pressure reducer

(4) Pressure reducer outlet, tighten to

(5) Pressure reducer inlet, tighten to

(6) Clickfit union, tool

: 0,6

: 8005-T.A Black

: 0,7

(7) Compressor inlet, tighten to

(8) Compressor outlet, tighten to

(9) Filtering cartridge

: 0,7

: Not interchangeable

(10) Condenser outlet, tighten to

(11) Pressostat, tighten to

(12) Condenser inlet, tighten to

(13) Buffer capacity

: 0,6

«a» Compressor front support

«b» Compressor rear support

: 3,9

: 2,5

C5HP1E0P

216

AIR CONDITIONING SYSTEM R.134.a

Engine: DT17BTED4

Tightening torques (m.daN).

(1) High pressure valve

(2) Low pressure valve

(3) Pressure reducer

(4) Pressure reducer outlet, tighten to

(5) Pressure reducer inlet, tighten to

(6) Clickfit union, tool

: 0,6

: 8005-T.A Black

: 0,7

(7) Compressor inlet, tighten to

(8) Compressor outlet, tighten to

(9) Filtering cartridge

: 0,7

: Not interchangeable

(10) Condenser outlet, tighten to

(11) Pressostat, tighten to

(12) Condenser inlet, tighten to

(13) Buffer capacity

: 0,6

«a» Compressor front support

«b» Compressor rear support

: 3,9

: 2,5

C5HP1DRP

217

Air Conditioning for Your Citroen C6 4 Door First Generation (2005-2012)

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