air filter RENAULT TWINGO 2009 2.G Heating And Air Conditioning - Manual Air Conditioning Workshop Manual

62C-10
MR-413-X44-62C000$273_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Role of components62C
–Condenser:
The condenser is composed of flat horizontal aluminium tubes. The pipes are divided by the vanes in order to
increase the air heat exchange and therefore cool the refrigerant fluid to produce condensation.
1Condenser
2Dehydration canister
–Dehydrator reservoir:
The dehydrator reservoir is used to:
●Check the condition of the refrigerant.
●Absorb the variations in volume (expansion bottle principle).
●Filter impurities.
●Absorb moisture (water in the circuit).
–Air conditioning unit:
This unit acts as an air mixing box. It is equipped with a system of flaps which allow the air to be directed in
accordance with the requirements of the occupants whilst simultaneously allowing the temperature of the air
entering the passenger compartment to be modified by mixing hot and cold air.
–Thermostatic expansion valve: (see figure below)
This thermostatic-type expansion valve is used to check refrigerant expansion. It is located at the evaporator inlet.
–Evaporator: (see figure below)
●The evaporator is a heat exchanger which enables the air entering the passenger compartment to be cooled.
Note: Condensation of the air may occur thereby causing normal drops of water to form under the body.
1
1Expansion valve
2Evaporator

62C-37
MR-413-X44-62C000$819_eng.mif
V1
62C
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts
ALP 2 Air distribution fault
NOTESCheck that the air circuit (cabin filter, scuttle panel grille, air ducts etc.) is not blocked.
Make sure that the air circuit (cabin filter, scuttle panel grille, air ducts etc.) is not blocked.
Ensure that the passenger compartment blower is in good condition.
Repair, clean or change the cabin filter if necessary.
Ensure that the passenger compartment blower unit is properly sealed.
Repair if necessary.
Set the passenger compartment blower to maximum
speed with maximum hot or maximum cold and
move the temperature control.
Check that the blown air matches the request.
Is the air distribution correct?
NO
Remove the glovebox and the centre console in
order to visually check whether moving the control
causes the distribution flaps to move.
Is there movement?
NO
YESThe air distribution is operating correctly.
Explain to the customer how the system
operates.
YESCheck that the distribution flaps are in
good condition, the footwell distribution
flap linkages are in position, and that there
is no mechanical obstruction. If necessary,
repair or replace the air conditioning unit.
AFTER REPAIRCarry out a complete check with the diagnostic tool.
MR-413-X44-62C000$819_eng.mif

62C-39
MR-413-X44-62C000$819_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 3 Air flow fault
NOTES
Is the passenger compartment blower working?
Check all of the speeds: Does the flow vary in
accordance with the position of the speed switch?
YES
Make sure that the air circuit (cabin filter, scuttle panel grille, air ducts etc.) is not blocked.
Ensure that the passenger compartment blower is in good condition.
Clean or replace the cabin filter.
With the cabim filter removed, put your hand into the
housing to ensure that the evaporator is not
obstructed and that there is no ice.
Is the evaporator obstructed?
NO
Ensure that the passenger compartment blower unit is properly sealed. Also check that the air distribution ducts
(right-hand and left-hand, upper and lower) are correctly connected to the housing as well as the refrigeration pipe
in the glove box (if the customer complains about a feeling of cold air on the passenger's side).
Repair if necessary.
Check that the air recirculation flap does not remain closed when in the recirculation position.
Repair if necessary.
Does the fault disappear when the air distribution
is changed ?
NO
See ALP5.
AFTER REPAIRCarry out a complete check with the diagnostic tool.
NORepair, see ALP 5.
YESRemove the evaporator and clean if it is
blocked.
If there is ice on the evaporator, perform a
conformity check on the temperature
sensors (exterior and coolant
temperatures).
Replace any faulty components.
YESEnsure that all the air vents are open.
If the fault is still present, refer to ALP 2.

62C-42
MR-413-X44-62C000$819_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 5 No passenger compartment ventilation
NOTESCheck that fuse F28 (30A) is in good condition.
Check that the air circuit (cabin filter, scuttle panel grille, air ducts etc.) is not blocked.
Is the air circuit in good condition?
YES
Check the condition of the passenger compartment blower blades.
Are the passenger compartment blower blades in good condition?
YES
Check that the air recirculation flap does not remain
closed when in the recirculation position.
Repair if necessary.
Is the fault still present when the air distribution is
changed?
NO
NO
If necessary, repair, clean or replace the
cabin filter (see MR 411 Mechanical, 61A,
Heating, Cabin filter: Removal -
Refitting).
NO
If necessary, repair, clean or replace the
passenger compartment blower blades
(see MR 411 Mechanical, 61A, Heating,
Fan assembly: Removal - Refitting).
YESEnsure that all the air vents are open.
If the fault is still present (see ALP2 Air
distribution fault).
AFTER REPAIRCarry out a complete check with the diagnostic tool.

62C-60
MR-413-X44-62C000$910_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 11 Unpleasant odours in the passenger compartment
NOTESNone.
Check that the cabin filter is not blocked or
damaged.
Is the fault still present?
YES
Check that the condensate drain pipe (water from
the evaporator) is not blocked.
Is the fault still present?
YES
Check that there are no leaks on the heating unit in
relation to the engine compartment:
- Foam seal on the heater matrix coolant pipes fitted
and in good condition.
- Rubber seal on the radiator tank fitted and in good
condition (seal under the bonnet separating the
engine compartment from the windscreen aperture).
- Drain valve on the radiator tank fitted and in good
condition.
Repair if necessary.
Is the fault still present?
YES
Remove the cabin filter to apply air conditioning
system cleaner using an extension pipe on the
evaporator.
Spray the entire contents of the aerosol.
Leave the product to work for 15 minutes.
NOEnd of fault finding procedure.
NOEnd of fault finding procedure.
NOEnd of fault finding procedure.
AFTER REPAIRCarry out a complete check with the diagnostic tool.