2009 RENAULT TWINGO RS cooling

62C-7
MR-413-X44-62C000$182_eng.mif
V1
62C
MANUAL AIR CONDITIONING
Fault finding - List and location of components
System (cold loop, hot loop and components)
1Air conditioning unit
2Heater matrix
3Expansion valve and evaporator
4Coolant circuit
5Cold loop
6Condenser and radiator
7Compressor
●COLD LOOP COMPONENTS:
–Compressor: This is located at the bottom on the left-hand side, next to the radiator in the engine compartment.
–Condenser: This is located between the radiator and the cooling fan assembly.
–Dehydrator reservoir: This is located on the left-hand side of the condenser outlet.
–Heating and air conditioning unit: This is located under the dashboard.
–Thermostatic expansion valve: This is located to the left of the heating and air conditioning unit on the
bulkhead.
–Evaporator: This is located to the right of the thermostatic expansion valve in the heating and air conditioning
unit.
–High pressure pipe: this pipe connects the compressor, condenser, dehydrator reservoir, and expansion valve
inlet in series (it is located in the engine compartment on the left-hand side).
–Low pressure pipe: this pipe connects the expansion valve, buffering capacity, evaporator, and compressor
inlet in series (it is located in the engine compartment on the left-hand side).
MR-413-X44-62C000$182_eng.mif

62C-8
MR-413-X44-62C000$182_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - List and location of components62C
●HEATING COMPONENTS
–Heater matrix: This is located at the bottom of the heating and air conditioning unit.
–Heating resistors: These are located at the bottom of the heater matrix on the driver's side (depending on the
equipment).
●ACTUATORS:
–Air distribution flap: This is located in the heating and air conditioning unit.
–Air mixing flap: This is located in the heating and air conditioning unit.
–Recirculation flap: This is located behind the dashboard.
–Flap motors: These are located close to the flaps (climate control).
●OTHERS
–Passenger compartment blower unit: This is located in the heating and air conditioning unit.
–Cooling fan assembly: This is located in the front panel of the vehicle, in front of the condenser.
–Air pipes: These are located under the dashboard.

62C-13
MR-413-X44-62C000$273_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Role of components62C
Resistive Blower Dimmer Module (MVPR)
1Thermal fuse
2Fan assembly connector
3Connector to Control panel
The passenger compartment blower unit is used to vary the rate at which air is blown into the passenger
compartment, depending on the requirements of the customer.
–Cooling fan assembly:
The cooling fan assembly motor is normally used in order to promote heat exchange in the condenser and therefore
improve the performance of the air conditioning system. Activation of the air conditioning fan unit depends, among
other things, on the vehicle speed and high pressure in the loop.
–Air pipes:
The air flows into an open air inlet scoop towards the exterior. Therefore there must be enough air flow for it to be
channelled into the passenger compartment. This flow can be created by the vehicle speed (in non-recirculation
mode) or by activating the blower. The air flowing into the passenger compartment is protected by a grille and a rain
shield in order to prevent foreign bodies and water from entering. The air is then distributed inside the passenger
compartment.
Passenger compartment air pipes
1Air inlet
2De-icing
3Right-hand air vent
4Left-hand air vent
5Centre air vents
6Left-hand footwell vent
7Right-hand footwell vent

62C-19
MR-413-X44-62C000$455_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Function62C
Vehicle
multiplex
network
Summary diagram of components controlled or managed by the UCH:
Summary diagram of components controlled or managed by the injection computer Rear screen de-icing and
rear-view mirror de-icer
(depending on version)External temperature
sensor
(depending on
version)
Actuator control Sensor management
UCH
Air conditioning request
managementHeated rear screen control
management
Relay No. 1 for
the Passenger
Compartment
Heating
ResistorsRelay No. 2 for
the Passenger
Compartment
Heating
ResistorsAir conditioning
compressorEngine cooling
fan assemblyEngine
coolant
temperature
sensorRefrigerant
fluid
pressure
sensor
Actuator control Sensor management
Engine injection computer
Management of the cold loop (refrigerant pressure, engine cooling fan activation request,
compressor activation authorisation, etc.)
Key:
Wire connections =
Multiplex connections =

62C-51
MR-413-X44-62C000$819_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 8
CONTINUED 3
Carry out fault finding on the injection system to ensure that no fault is present (if faults are displayed by the
injection computer, engagement of the air conditioning may be inhibited). If there are present or stored faults,
carry out the necessary repairs (see 13B, Diesel injection or 17B, Petrol injection).
Check that the refrigerant fluid pressure is correct (neither too low nor too high) using the PR037 Refrigerant
fluid pressure parameter (see Conformity check, Cold loop sub-function).
Check that the engine cooling fan assembly is at
speed 1 by viewing the following status on the cold
loop sub-function screen:
–Status ET022 Low-speed fan assembly request
should display ACTIVE.
Note:
These statuses are not displayed by all types of
injection (see Conformity check, Cold loop sub-
function).
Does the engine cooling fan operate at low speed?
YES
NOUsing the diagnostic tool, run
command AC154 Low speed fan
assembly relay.
Does the engine cooling fan operate
at low speed?
NO YES
Connector of component 321 disconnected. Connect a
test light between connection 49L of component 321
and the chassis earth and run command AC154 Low
speed fan assembly relay.
Does the test light illuminate?
YES NO
Measure the resistance of component 321, between
connections 49L and 49B of component 321. If the
resistance measured is infinite, replace the fan assembly
resistor (component 321).
Carry out fault
finding on the
injection system
(sub-function: cold
loop and engine
cooling for low
speed fan assembly
activation).
D
AFTER REPAIRCarry out a complete check with the diagnostic tool.

62C-61
MR-413-X44-62C000$910_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 12 Water is present in the passenger compartment
NOTESNone.
Pressurise the cooling circuit.
Is there any coolant leaking into the vehicle?
NO
Check that the condensate drain pipe (water from
the evaporator) is not blocked.
Repair if necessary.
Is the fault still present?
YES
Make sure that the scuttle panel (under the windscreen aperture) is not filled with water.
If it is, check that the drain valve is fitted to the scuttle panel and is in good condition.
Replace the valve if necessary.
Has the customer just washed the vehicle?
YES
Explain to the customer that when washing the car
using a hose pipe, the water jet must not be left for
too long on the air inlet in the scuttle panel (on the
bonnet).
YES Repair.
NOEnd of fault finding procedure.
NO End of fault finding procedure.
AFTER REPAIRCarry out a complete check with the diagnostic tool.