air conditioning RENAULT TWINGO 2009 2.G Heating And Air Conditioning - Climate Control 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."
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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-X44-62B000$000_engTOC.mif
CLIMATE CONTROL
Vdiag No.: 44
Fault finding - Introduction 62B - 2
Fault finding - List and location of components 62B - 8
Fault finding - Role of components 62B - 10
Fault finding - Operating diagram 62B - 16
Fault finding - Function 62B - 17
Fault finding - Replacement of components 62B - 21
Fault finding - Configuration and programming 62B - 22
Fault finding - Fault summary table 62B - 24
Fault finding - Interpretation of faults 62B - 25
Fault finding - Conformity check 62B - 32
Fault finding - Status summary table 62B - 42
Fault finding - Interpretation of statuses 62B - 45
Fault finding - Interpretation of parameters 62B - 52
Fault finding - Command summary table 62B - 61
Fault finding - Interpretation of commands 62B - 62
Fault finding - Customer complaints 62B - 66
Diagnostic - Fault finding chart 62B - 68
Fault finding - Help 62B - 96
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Fault finding - Introduction

Vdiag No.: 44
62B
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 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 on the conformity check for the air conditioning function:
All variables (statuses and parameters) and commands required for the air conditioning function are divided into
three sub-functions:
●The COLD LOOP sub-function groups together all the information required for producing cold air.
●The HEATING sub-function groups together all the information required for producing warm air.
●The PASSENGER COMPARTMENT VENTILATION sub-function groups together all the information relating to
ventilation and the mixing and distribution of air within the passenger compartment.

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Vdiag No.: 44CLIMATE CONTROL
Fault finding - Introduction62B
The conformity check for the air conditioning function is split into two parts:
For all signals relating to the sensors and actuators controlled by the climate control panel (distribution motor,
mixing motor, recirculation motor, passenger compartment ventilation, interior temperature, etc.), (see 62B, Climate
control, Conformity check).
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 complaints. Note:
The interpretation of statuses, parameters and commands is also split into several sections. Everything which is
controlled by the control panel of the climate control function is dealt with in this section. However, signals from
other computers are interpreted in the Fault finding Workshop Repair Manuals for the computers which
produce these signals.
A summary of the overall procedure to follow is provided on the following page in the
form of a flow chart.

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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).

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Fault finding - List and location of components

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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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Fault finding - Role of components
●COLD LOOP COMPONENTS
System assembly
1Heating and air conditioning unit
2Heater matrix
3Expansion valve and evaporator
4Coolant circuit
5Cold loop
6Condenser and radiator
7Compressor
–Compressor:
The compressor is not activated when the exterior temperature is less than 0˚; it is used to compress the refrigerant
fluid into gas. The pressure can reach up to 28 bar.
Air conditioning compressor

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Fault finding - Role of components

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62B
–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.
Condenser + Dehydrator reservoir
1Condenser
2Dehydration canister
–Dehydrator reservoir: (see figure above)
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).
–Heating and air conditioning unit: (see figure above)
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.
Evaporator + expansion valve
1Expansion valve
2Evaporator

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Fault finding - Role of components

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62B
–High and low pressure pipes: (see figure below)
●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.
Cold loop pipes
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
●HEATING COMPONENTS
–Heater matrix:
The external air entering the heating and air conditioning device (HVAC) is heated by the heater matrix.
–Passenger Compartment Heating Resistors (depending on the equipment): (see figure below)
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).

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Fault finding - Role of components

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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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Fault finding - Operating diagram
Summary diagram of all the components of the air conditioning system
1Evaporator
2Temperature sensor
3Compressor
4Condenser
5Fan assembly
6Pressure switch
7Dehydration canister
8Expansion valve

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