RENAULT SCENIC 2009 J84 / 2.G Air Conditioning Manual Conditioning User Guide

62C-11
MANUAL AIR CONDITIONING
Fault finding – Fault Finding Chart62C
V2 MR-372-J84-62C000$040.mif
MANUAL AIR CONDITIONING
Fault finding – Fault Finding Chart
ALP 2 Air distribution fault
NOTESNone.
Make sure the air circuit (cabin filter, scuttle panel grille, air ducts etc.) is not blocked.
Ensure that the passenger compartment ventilator fan is in good condition.
If necessary, repair, clean or replace the cabin filter.
Ensure that the passenger compartment fan unit is properly sealed.
Repair if necessary.
Switch the front passenger compartment fan to
full, the temperature control to maximum heat or
maximum cold, and move the air distribution
control.
Check that the air outlet is the one selected.
Has the customer complaint been
confirmed?
NO
Remove the dashboard and visually check that
moving the control alters the position of the
distribution flaps.
Is there movement?
NO
The air distribution is operating
correctly.
If necessary, explain how the system
works to the customer again.
Make sure the distribution flaps are
in good condition, the footwell
distribution flap linkages are in
position, and that there is no
mechanical obstruction.
If necessary, recondition, clean or
replace the heating and ventilation
unit.
YES
YES
AFTER REPAIRCheck that the system is operating correctly.

MANUAL AIR CONDITIONING
Fault finding – Fault Finding Chart62C
62C-12V2 MR-372-J84-62C000$040.mif
ALP 2
CONTINUED
Check that the cable routing is clean and that the cables are in good condition.
Repair if necessary.
Make sure that the controls are in good condition and that they move the cables correctly.
Repair if necessary.
End of fault finding procedure.
AFTER REPAIRCheck that the system is operating correctly.

62C-13
MANUAL AIR CONDITIONING
Fault finding – Fault Finding Chart62C
V2 MR-372-J84-62C000$040.mif
ALP 3 Air flow fault
NOTESNone.
Is the passenger compartment fan working?
YES
Make sure the air circuit (cabin filter, scuttle panel grille, air ducts etc.) is not blocked.
Ensure that the passenger compartment blower is in good condition.
If necessary, repair, clean or replace the cabin filter.
With the cabin filter removed, put your hand into
the housing to ensure that the evaporator is not
being obstructed and that there is no ice.
Is the evaporator obstructed?
NO
Ensure that the passenger compartment fan unit is properly sealed. Also check that the air distribution ducts
(right and left, upper and lower) are correctly connected to the housing as well as the refrigeration pipe in the
glove box (if the customer complains about a feeling of cold air on the passenger side).
Repair if necessary.
Check that the air recirculation flap does not remain closed when in the recirculation position.
Repair if necessary.
Does the fault disappear when the air
distribution is changed?
NO
Repair, see ALP 5.
Remove the evaporator and clean
if it is blocked.
If there is ice on the evaporator,
perform a conformity check on the
temperature sensors (exterior and
coolant temperatures).
Replace any faulty components.
Ensure that all the air vents
are open.
If the fault is still present, see ALP 2.
NO
YES
YES
AFTER REPAIRCheck that the system is operating correctly.

MANUAL AIR CONDITIONING
Fault finding – Fault Finding Chart62C
62C-14V2 MR-372-J84-62C000$040.mif
ALP 3
CONTINUED
Check that there is a + 12 V accessories supply on track B1 of the resistor unit and an earth on track A1 of the
control panel connector.
Repair if necessary.
Make sure that the control panel speed selection button works properly.
Repair if necessary.
Make sure the resistor unit functions properly.
Replace the resistor unit if the resistances of the first three speeds are not:
Speed 1 (tracks A1 and A4): 1.97 ΩΩ Ω Ω
Speed 2 (tracks A2 and A4): 1.3 ΩΩ Ω Ω
Speed 3 (tracks A3 and A4): 0.41 ΩΩ Ω Ω
Check the insulation, continuity and absence of interference resistance of the connections:
Control panel track A2 Track A1 of the resistor unit
Control panel track A3 Track A2 of the resistor unit
Control panel track A4 Track A3 of the resistor unit
Control panel track A5 Track A4 of the resistor unit
Repair if necessary.
Check the insulation, continuity and absence of interference resistance of the connections:
Fan assembly track 2 Track A4 of the resistor unit
Repair if necessary.
Make sure the fan blade is in good condition and not wobbling on its axle.
Repair if necessary.
End of fault finding procedure.
AFTER REPAIRCheck that the system is operating correctly.

62C-15
MANUAL AIR CONDITIONING
Fault finding – Fault Finding Chart62C
V2 MR-372-J84-62C000$040.mif
ALP 4 Inefficient windscreen demisting
NOTESSpecial notes:
Check that the inside of the windows are not dirty, as this reduces the efficiency
of demisting.
Is the passenger compartment fan working?
YES
Check that the air extraction vents are not
blocked.
Repair if necessary.
Is the fault still present?
YES
Check that there are no water leaks into the
passenger compartment which would
significantly increase the humidity levels and
reduce the effectiveness of demisting.
Repair if necessary (see ALP 12).
Is the fault still present?
YES
Make sure the compressor is operating
correctly by turning on the air conditioning.
Does the compressor work?
YES
Repair, see ALP 5.
End of fault finding procedure.
End of fault finding procedure.
See ALP 8 (section 62A).
NO
NO
NO
NO
AFTER REPAIRCheck that the system is operating correctly.

62C-16
MANUAL AIR CONDITIONING
Fault finding – Fault Finding Chart62C
V2 MR-372-J84-62C000$040.mif
ALP 4
CONTINUED
Check that the condensation evacuation outlet (water from the evaporator) is not blocked.
Repair if necessary.
Is it an air distribution fault?
NO
Is it an air flow fault?
NO
Is it a heater performance fault?
NO
Check that the recirculation flap is in the exterior air position.
Repair if necessary.
End of fault finding procedure.
See ALP 2.
See ALP 3.
See ALP 6 (section 62A).
YES
YES
YES
AFTER REPAIRCheck that the system is operating correctly.

62C-17
MANUAL AIR CONDITIONING
Fault finding – Fault Finding Chart62C
V2 MR-372-J84-62C000$040.mif
ALP 5 No passenger compartment ventilation
NOTESNone.
Check that the fusesare in good condition.
Make sure that the air circuit (cabin filter, scuttle panel grille, air vents and extractors etc.) is not blocked.
Ensure that the passenger compartment blower is in good condition.
Repair, clean or change the cabin filter if necessary.
Ensure that the passenger compartment fan unit is properly sealed.
Repair if necessary.
Check that the air recirculation flap does not remain closed when in the recirculation position.
Repair if necessary.
Does the fault disappear when the air
distribution is changed?
NO
Ensure that there is + 12 V accessories supply on track B1 of the resistor unit and an earth on track A1 of the
control panel connector.
Repair if necessary.
Ensure that all the air vents are open.
If the fault is still present, see ALP 2.
YES
AFTER REPAIRCheck that the system is operating correctly.

MANUAL AIR CONDITIONING
Fault finding – Fault Finding Chart62C
62C-18V2 MR-372-J84-62C000$040.mif
ALP 5
CONTINUED
Make sure that the control panel speed selection button works properly.
If necessary, recondition or replace the control panel.
Make sure the resistor unit functions properly.
Replace the resistor unit if the resistances of the first three speeds are not:
Speed 1 (tracks A1 and A4): 1.97 ΩΩ Ω Ω
Speed 2 (tracks A2 and A4): 1.3 ΩΩ Ω Ω
Speed 3 (tracks A3 and A4): 0.41 ΩΩ Ω Ω
Check the insulation, continuity and absence of interference resistance of the connections:
Control panel track A2 Track A1 of the resistor unit
Control panel track A3 Track A2 of the resistor unit
Control panel track A4 Track A3 of the resistor unit
Control panel track A5 Track A4 of the resistor unit
Repair if necessary.
Check the insulation, continuity and absence of interference resistance of the connections:
Fan assembly track 2 Track A4 of the resistor unit
Repair if necessary.
Make sure the fan blade is in good condition and not wobbling on its axle.
Repair if necessary.
Disconnect the black 2-track connector of the engine cooling fan and check the resistance of the motor
between tracks 1 and 2.
Replace the engine cooling fan if the resistance is not between 0.2 Ω and 0.5 Ω.
End of fault finding procedure.
AFTER REPAIRCheck that the system is operating correctly.

62C-19
MANUAL AIR CONDITIONING
Fault finding – Fault Finding Chart62C
V2 MR-372-J84-62C000$040.mif
AFTER REPAIRCheck that the system is operating correctly.
ALP 11 Unpleasant odours in the passenger compartment
NOTESNone.
Check that the cabin filter is not blocked or damaged.
Replace it if necessary.
Is the fault still present?
YES
Check that the condensation evacuation pipe
(water from the evaporator) is not blocked.
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).
–Water evacuation valve on the radiator tank fitted and in
good condition.
Repair if necessary.
Is the fault still present?
YES
Remove the cabin filter to apply air conditioning system
cleaner using an extension pipe on the evaporator.
Spray the entire contents of the aerosol.
Leave the product to work for 15 minutes.
End of fault finding
procedure.
End of fault finding
procedure.
End of fault finding
procedure.
NO
NO
NO

62C-20
MANUAL AIR CONDITIONING
Fault finding – Fault Finding Chart62C
V2 MR-372-J84-62C000$040.mif
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 condensation evacuation pipe
(water from the evaporator) is not blocked.
Repair if necessary.
Is the fault still present?
YES
Ensure that the plenum chamber (under the windscreen aperture) is not filled with water.
If it is, check that the water evacuation valve is fitted to the plenum chamber 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
vehicle using a hose pipe, the water jet must not
be left for too long on the air inlet in the plenum
chamber (on the bonnet).
Repair.
End of fault finding procedure.
End of fault finding procedure.
YES
NO
NO
AFTER REPAIRCheck that the system is operating correctly.