Get Air Conditioning -> Checking the Efficiency of the Air Conditioning System Guide for Citroen C6 4 Door First Generation (2005-2012)

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 -> Checking the Efficiency of the Air Conditioning System for Your Citroen C6 4 Door First Generation (2005-2012)

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