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

Heating and
air conditioning system
"The repair procedures given by the manufacturer in this document are based on the
technical specifications current when it was prepared.
The procedures may be modified as a result of changes introduced by the
manufacturer in the production of the various component units and accessories from
which his vehicles are constructed."
V1
All rights reserved by Renault s.a.s.
Edition Anglaise
Copying or translating, in part or in full, of this document or use of the service part
reference numbering system is forbidden without the prior written authority of
Renault s.a.s.
© Renault s.a.s.
V1 MR-413-X44-62C000$000_engTOC.mif
MANUAL AIR CONDITIONING
Fault finding - Introduction 62C - 2
Fault finding - List and location of components 62C - 7
Fault finding - Role of components 62C - 9
Fault finding - Operating diagram 62C - 14
Fault finding - Function 62C - 15
Diagnostics - Configuration and programming 62C - 21
Fault finding - Conformity check 62C - 22
Fault finding - Customer complaints 62C - 35
Fault finding - Fault finding charts 62C - 37
62C
MR-413-X44-62C000$000_engTOC.mif

62C-3
MR-413-X44-62C000$091_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Introduction62C
Faults
Faults are declared as either present or stored (depending on whether they appeared in a certain context and have
disappeared since, or whether they remain present but have not been diagnosed within the current context).
The present or stored status of faults should be taken into consideration when the diagnostic tool is switched on
after the + after ignition feed (without any system components being active).
For a present fault, apply the procedure described in the Interpretation of faults section.
For a stored fault, note the faults displayed and apply the instructions in the Notes section.
If the fault is confirmed when the instructions in the Notes section are applied, the fault is present. Deal with the fault
If the fault is not confirmed, check:
–the electrical lines which correspond to the fault,
–the connectors on these lines (corrosion, bent pins, etc.),
–the resistance of the component detected as faulty,
–the condition of the wires (melted or split insulation, wear).
Conformity check
The aim of the conformity check is to check data that does not produce a fault on the diagnostic tool because the
data is inconsistent. Therefore, this stage is used to:
–carry out fault finding on faults that do not have a fault display, and which may correspond to a customer
complaint.
–check that the system is operating correctly and that there is no risk of a fault recurring after repairs.
This section gives the fault finding procedures for statuses and parameters and the conditions for checking them.
If a status is not behaving normally or a parameter is outside the permitted tolerance values, consult the
corresponding fault finding page.
Special notes regarding conformity checks for the air conditioning system:
The air conditioning system conformity check is divided into four parts. The parts relate to the four sub-functions of
the air conditioning system: heating, cold loop, user selection and passenger compartment ventilation. The statuses
and parameters related to these sub-functions are listed with their respective computers.
Special notes: The air conditioning control panel does not control electrical components (other than the passenger
compartment fan assembly) and it cannot support fault finding.
Customer complaints - Fault finding chart
If the test with the diagnostic tool is OK but the customer complaint is still present, the fault should be processed by
customer complaint. Note:
The interpretation of statuses, parameters and commands is also split into several sections. Everything controlled
by the air conditioning control panel is explained in the two Air conditioning sections (62B and 62C). On the
other hand, signals from other computers are explained in the fault finding sections for these computers (see
conformity check).
A summary of the overall procedure to follow is provided on the following page in the
form of a flow chart.

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-11
MR-413-X44-62C000$273_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Role of components62C
–High and low pressure pipes:
●The High Pressure and Low Pressure pipes are composed of rigid aluminium pipes and flexible pipes that
enable engine-related movements to be absorbed.
●Two filler valves (High Pressure and Low Pressure) can be accessed in order to fill (or drain) the refrigerant loop.
●The connections must be checked in the event of a refrigerant fluid leak.
1Buffering capacity
2Expansion valve outlet
3Expansion valve inlet
4High pressure filler valve
5Low pressure filler valve
6Condenser inlet
7Condenser outlet
8Pressure sensor
9Compressor inlet
10 Compressor outlet
Figure 6: Cold loop pipes
●HEATING COMPONENTS
–Heater matrix:
The external air entering the heating and air conditioning device (HVAC) is heated by the heater matrix.

62C-12
MR-413-X44-62C000$273_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Role of components62C
–Passenger compartment heating resistors (depending on the equipment level):
The passenger compartment heating resistors (RCH) are electrical heating devices in the air conditioning unit. This
system is an additional heating system which operates when the engine is cold (when starting).
ACTUATORS
–Air distribution flap:
This flap enables the air flowing into the passenger compartment to be directed.
–Air mixing flap:
This flap mixes the air in order to meet the temperature requirements of the occupants.
–Recirculation flap:
This flap prevents the entry of exterior air. In this case, the passenger compartment is isolated from the exterior and
air is blown in the passenger compartment in a closed circuit.
These three flaps are controlled by a cable.
●OTHERS
–Passenger compartment blower unit:
The passenger compartment blower unit is controlled by the Resistive Blower Dimmer Module (MVPR).

62C-15
MR-413-X44-62C000$455_eng.mif
V1
62C
MANUAL AIR CONDITIONING
Fault finding - Function
Layout of the air conditioning function:
The “air conditioning” function is divided between two computers. These two computers are connected by the CAN
multiplex network; the connection between the air conditioning control panel and the UCH is provided by a wire
connection.
The air conditioning control panel interprets the driver's demands.
The UCH sends the request for compressor activation to the injection system.
The injection computer controls the passenger compartment heating resistors (depending on the equipment).
It authorises or denies compressor activation depending on the vehicle operation and refrigerant pressure.
Air conditioning control panel: front panel
Passenger compartment ventilation and heating control rear panel
MR-413-X44-62C000$455_eng.mif

62C-16
MR-413-X44-62C000$455_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Function62C
General operation
The air conditioning system is composed of four sub-functions: heating, cold loop, passenger compartment
ventilation and user selection. Fault finding on the air conditioning is performed in two different ways using the
diagnostic tool.
The first procedure consists of performing fault finding on each computer which allows dialogue to be established
with just one computer (select the UCH computer).
The second procedure consists of performing fault finding on each function which allows communication with both
computers of the air conditioning function.
Description of the sub-functions:
Heater sub-system: this sub-system includes everything relating to the production of warm air in the vehicle and
management of the heated rear screen.
The UCH computer controls the rear screen de-icing.
The injection computer manages passenger compartment heating resistor actuation
Cold loop sub-system: this sub-system includes everything involved in the production of cold air in the vehicle.
The computers concerned include:
The injection computer, which authorises compressor activation and controls the compressor and motor-driven fan
assemblies.
The UCH, which authorises or denies the request for compressor activation from the air conditioning control panel to
the injection computer in accordance with the condition of the passenger compartment blower and the exterior
temperature (depending on the equipment).
User selection sub-function: This sub-function includes everything used to transmit the user's requests (pressing
buttons). The computer involved is the UCH computer.

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-21
MR-413-X44-62C000$546_eng.mif
V1
62C
MANUAL AIR CONDITIONING
Diagnostics - Configuration and programming
Air conditioning system configurations
Air conditioning system configuration readingsComputers Configuration Option Comments
UCHCF019: Type of air
conditioning– Heating
– Manual
– Climate control
CF029: Exterior
temperature
sensor–With
–None
INJECTION (all types) X XAutomatic computer
configuration
Computers Configuration readings Option Comments
UCHLC013: Type of air
conditioning– Climate control
– Manual air
conditioning
– Heating
None
LC002: External
temperature
sensor– With
– None
MR-413-X44-62C000$546_eng.mif