cooling RENAULT TWINGO RS 2009 2.G Heating And Air Conditioning - Climate Control Workshop Manual

62B-8
MR-413-X44-62B000$092_eng.mif
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62B
CLIMATE CONTROL
Fault finding - List and location of components
List and location of components
System (cold loop, hot loop and components)
1Heating and air 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).

Vdiag No.: 44
MR-413-X44-62B000$092_eng.mif

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CLIMATE CONTROL
Fault finding - List and location of components

Vdiag No.: 44
62B
●HEATING COMPONENTS
–Heater matrix: This is located at the bottom of the heating and air conditioning unit.
–Passenger compartment heating resistors: These are located at the bottom of the heater matrix on the
driver's side (depending on the equipment).
●SENSOR
–Interior temperature sensor: This is located on the interior rear-view mirror.
●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.
●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.
–Climate control computer: This is located in the control panel.
–Air pipes: Theses are located under the dashboard.

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CLIMATE CONTROL
Fault finding - Role of components

Vdiag No.: 44
62B
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.
–Climate control computer:
The climate control computer is in permanent communication with the UCH and injection computers. It controls a
number of parameters:
●Meteorological (temperature, etc.)
●Vehicle (speed, engine speed, circuit temperature and pressure)
●Comfort (interior temperature).
Climate control panel: front panel
Climate control panel: rear panel

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Vdiag No.: 44CLIMATE CONTROL
Fault finding - Function62B
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 =

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Vdiag No.: 44CLIMATE CONTROL
Diagnostic - Fault finding chart62B
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
NO
Using 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
Carry out fault finding
on the injection
system (sub-function:
cold loop and engine
cooling for low speed
fan assembly
activation).
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).D
AFTER REPAIRCarry out a complete check with the diagnostic tool.

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Vdiag No.: 44CLIMATE CONTROL
Diagnostic - Fault finding chart62B
ALP 12 Water is present in the passenger compartment
NOTESOnly consult this customer complaint after a complete check with the diagnostic
tool.
Pressurise the cooling circuit.
Is there any coolant leaking into the vehicle?
NO
Check that the evaporator evacuation ring is not
blocked (under the body).
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.
CLIM_V44_ALP12

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CLIMATE CONTROL
Fault finding - Help

Vdiag No.: 44
62B
OPERATION OF THE ENGINE COOLING FAN ASSEMBLY AS A FUNCTION OF THE REFRIGERANT FLUID
PRESSURE AND VEHICLE SPEED
Relative pressure (bar)
GMV = 1 Low-speed engine cooling fan
GMV = 2 High-speed engine cooling fan
GMV = 0 Engine cooling fan stopped
The engine cooling fan assembly is not used for vehicle speeds in excess of 70 km/h, except in rare cases where
the refrigerant fluid pressure is greater than 23 bar despite the high speed (e.g. driving behind a lorry).
When the vehicle is stationary, the engine cooling fan is always used at low speed if the refrigerant fluid relative
pressure is below 19 bar, otherwise it is used at high speed.
While the vehicle is being driven, the engine cooling fan may either not operate, or operate at low or high speed
depending on the refrigerant fluid pressure at the condenser outlet and the vehicle speed.27
23
19
11
1
0AIR CONDITIONING INHIBITION
GMV = 2
GMV = 2 GMV = 1 GMV = 0
GMV = 1 GMV = 0
GMV = 1 GMV = 0
AIR CONDITIONING INHIBITION
20 30 45 70Vehicle speed in mph