62C-10
MR-413-X44-62C000$273_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Role of components62C
–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.
1Condenser
2Dehydration canister
–Dehydrator reservoir:
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).
–Air conditioning unit:
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.
1
1Expansion valve
2Evaporator
62C-51
MR-413-X44-62C000$819_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Fault finding charts62C
ALP 8
CONTINUED 3
Carry out fault finding on the injection system to ensure that no fault is present (if faults are displayed by the
injection computer, engagement of the air conditioning may be inhibited). If there are present or stored faults,
carry out the necessary repairs (see 13B, Diesel injection or 17B, Petrol injection).
Check that the refrigerant fluid pressure is correct (neither too low nor too high) using the PR037 Refrigerant
fluid pressure parameter (see Conformity check, Cold loop sub-function).
Check that the engine cooling fan assembly is at
speed 1 by viewing the following status on the cold
loop sub-function screen:
–Status ET022 Low-speed fan assembly request
should display ACTIVE.
Note:
These statuses are not displayed by all types of
injection (see Conformity check, Cold loop sub-
function).
Does the engine cooling fan operate at low speed?
YES
NOUsing the diagnostic tool, run
command AC154 Low speed fan
assembly relay.
Does the engine cooling fan operate
at low speed?
NO YES
Connector of component 321 disconnected. Connect a
test light between connection 49L of component 321
and the chassis earth and run command AC154 Low
speed fan assembly relay.
Does the test light illuminate?
YES NO
Measure the resistance of component 321, between
connections 49L and 49B of component 321. If the
resistance measured is infinite, replace the fan assembly
resistor (component 321).
Carry out fault
finding on the
injection system
(sub-function: cold
loop and engine
cooling for low
speed fan assembly
activation).
D
AFTER REPAIRCarry out a complete check with the diagnostic tool.
