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-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.
MANUAL AIR CONDITIONING
Fault finding – Fault Finding Chart62C
62C-22V2 MR-372-J84-62C000$040.mif
ALP 14 Air conditioning noises during operation
NOTESOnly deal with this customer complaint after a full check with the diagnostic tool
(fault reading and configuration checks).
Check that the computers involved in the air conditioning function (Injection, Protection and Switching Unit,
UCH and Air conditioning control panel) are correctly configured.
Reconfigure if necessary (see 62A, Air conditioning, Configurations and Configuration reading).
Check that:
–the compressor fitted to the vehicle corresponds correctly to the engine (see MR 370 Mechanical, 62A, Air
conditioning, Air conditioning: Parts and consumables for the repair).
Replace the compressor if necessary (see MR 370, Mechanical, 62A, Air conditioning, Compressor:
Removal - Refitting).
–the compressor is correctly fixed (see MR 370 Mechanical, 62A, Air conditioning, Compressor: Removal -
Refitting).
Check the condition of the compressor belt and check its tension. Replace the belt if necessary (see MR 370
Mechanical, 11A, Top and front of engine, Accessories belt: Removal - Refitting).
Check that the intermediate pipes, condenser and dehydrator reservoir are correctly fitted.
–Check the mountings and brackets of the components.
–Check the contact between and proximity of the components.
(see MR 370 Mechanical, 62A, Air conditioning, Air conditioning: List and location of components).
Check the correct operation of the cooling fan assembly or passenger compartment fan assembly and
condenser:
–check the electrical supply of the fan using parameters ET007 High speed fan assembly control, AC009 Low
speed fan assembly and AC010 High speed fan assembly (see 62A, Air conditioning, Conformity check,
Cold loop sub-function).
Check the quantity of refrigerant (see MR 370 Mechanical, 62A, Air conditioning, Air conditioning: Parts
and consumables for the repair).
If the quantity of refrigerant is:
–Greater than the manufacturer's information, recharge according to the manufacturer's values (see MR 370
Mechanical, 62A, Air conditioning: Draining - Filling).
–Less than the manufacturer's information, check for leaks (see MR 370 Mechanical, 62A, Air conditioning,
Refrigerant circuit: Check).
If the fault is still present, replace the compressor (see MR 370, Mechanical, 62A, Air conditioning,
Compressor: Removal - Refitting).
AFTER REPAIRCarry out a complete check using the diagnostic tool.
