2009 RENAULT TWINGO RS heater

62B-8
MR-413-X44-62B000$092_eng.mif
V1
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

62B-9
MR-413-X44-62B000$092_eng.mif
V1
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.

62B-10
MR-413-X44-62B000$138_eng.mif
V1
62B
CLIMATE CONTROL
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

Vdiag No.: 44
MR-413-X44-62B000$138_eng.mif

62B-12
MR-413-X44-62B000$138_eng.mif
V1
CLIMATE CONTROL
Fault finding - Role of components

Vdiag No.: 44
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).

62B-77
MR-413-X44-62B000$828_eng.mif
V1

Vdiag No.: 44CLIMATE CONTROL
Diagnostic - Fault finding chart62B
ALP 5 No passenger compartment ventilation
NOTESOnly consult this customer complaint after a complete check with the diagnostic
tool.
Special notes:
The intermediate connector is located on the distribution-ventilation unit and the
passenger compartment blower unit control module is located slightly higher up,
below the heater matrix pipes.
Use the W iring Diagram Technical Note for the New Twingo.
Using the diagnostic tool, check that the passenger compartment
blower control setting given by the computer varies from 0 to 100 % by
checking parameter PR019 PASSENGER COMPARTMENT BLOWER
PWM SETTING (refer to the interpretation of this parameter).
Does the value vary?
Check that the control voltage (PWM) from the passenger compartment blower power module varies between 0
and 12 V (from 0 to 100 %) by measuring this voltage between connection 38LR of component 1023 and earth
MAN (connector disconnected).
Does the voltage vary correctly?
NOYES
Check the insulation and continuity of connection 38LR between components 419
and 1023.
If the connection is faulty (see Technical Note 6015A, Repairing electrical wiring,
Wiring: Precautions for the repair), repair the wiring, otherwise replace the wiring.
Before ignition feed, check for + 12 V accessories feed on connection SP3 of
component 1023 in relation to the chassis earth.
●Check the continuity of connection MAN between the intermediate connector and
component 1023.
●Check the continuity of connection MAN between the intermediate connector and
the chassis earth.
If the connection is faulty (see Technical Note 6015A, Repairing electrical wiring,
Wiring: Precautions for the repair), repair the wiring, otherwise replace the wiring.
If there is no +12 V accessories feed, check the condition and position of fuse F28 (30A)
in the passenger compartment fuse box. Consult section 81C Fuses.
If the checks do not reveal any faults, carry out conformity check on component 1016
and component 1428 if the vehicle is fitted with electric windows.
NOContact the
Techline.
AFTER REPAIRCarry out a complete check with the diagnostic tool.
CLIM_V44_ALP5

62B-91
MR-413-X44-62B000$920_eng.mif
V1

Vdiag No.: 44CLIMATE CONTROL
Diagnostic - Fault finding chart62B
ALP 11 Unpleasant odours in the passenger compartment
NOTESOnly consult this customer complaint after a complete check with the diagnostic
tool.
Check that the cabin filter is not blocked or damaged
(see MR 411 Mechanical, 61A, Heating, Cabin filter:
Removal - refitting).
Replace it if necessary.
Is the fault still present?
YES
Check that the condensate (water from the evaporator)
drain ring is not obstructed (beneath the body).
Repair if necessary.
Is the fault still present?
YES
Check the sealing of 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 passenger compartment filter to apply air
conditioning system cleaner using an extension piece 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.
CLIM_V44_ALP11