AIR CONDITIONING
Fault finding - Fault Finding Chart62A
62A-55V4 MR-372-J84-62A000$080.mif
Manual air conditioning
and
Climate control
ALP 9
CONTINUED
Using the diagnostic tool statuses and parameters screen
(cold loop sub-function), check that the temperature signals
are correct (no sensor drift resulting in incorrect
measurement).
For manual air conditioning:
External air temperature and
engine coolant temperature.
For regulated climate control systems:
External air
temperature, engine coolant temperature and internal air
temperature.
Depending on the vehicle equipment, also check that the
internal air temperature sensor mini-turbine is operating
correctly (this can distort the measurement if it is faulty).
Are the temperature signals consistent?
YES
With the engine warm and
passenger compartment
ventilation operating, vary the
position of the mixing flap
from the very cold position to
the very hot position and
check subjectively that there
is a difference in temperature.
Can you feel the difference
in temperature?
YES
Check the refrigerant fluid
level.
NO
NOCarry out a conformity
check on the sensors (refer
to the relevant section).
Replace any faulty
components.
For climate control systems:
Carry out a conformity check on the mixing motor (PR012
Mixing motor). If the conformity check does not reveal any
faults, look for a mechanical fault with the mixing flap (condition
of the motor's toothed sector, flap jammed inside the unit, etc.).
For manual air conditioning systems:
Check the condition and routing of the mixing flap control
cable. Eliminate any constraints on it: kinks, cable restricted by
plastic clips, etc. Replace it if necessary. Unclip the cable from
the side of the unit and check the stiffness of movement of
each component: control button and flap control on the air
distribution unit.
Check that there is no mechanical fault with the mixing flap
(flap jammed inside the unit, etc.).
Carry out any necessary repairs.
AFTER REPAIRPerform a complete check using the diagnostic tool.
CLIM X84 1.1
Edition 2
