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12.2 The consequences of
insufficient air flow
The f low of air passing through the cabin
determines the thermal exchanges in the sys-
tem and, therefore, the performance of the air
conditioning.
Obstructing or reducing the air flow will immedia-
tely impact the comfort of the occupants and have
a damaging effect on the reliability of the system
components.
When servicing the system, it is essential to check
the complete air circuit, from capture to extraction:
g
Extraction of any residue (leaves, etc.) from the
air inlet circuit.
g
Replacing the cabin air filter.
g
Checking that the extractors are not blocked.
Simple action can be taken to prevent humidity in
the A/C loop:
g
Always follow an efficient vacuum procedure,
covering optimum vacuum level and appropriate
vacuum time according to the maintenance ope-
ration
g
Secure the seals of all the parts whenever the
loop is opened to prevent the ambient humidity
from entering the loop.
g
Effectively filter the refrigerant fluid in the loop in
the extraction phase.
g
Replace the drier element every 3 years, whenever
the loop is opened and in the event of major repairs
or an accident.
12.3 The consequences of
a lack of refrigerant
The heat exchanges are produced by the change in
state of the refrigerant fluid.
System performance will deteriorate if the refrige-
rant level is too low.
g
It is advisable to regularly operate the com-
pressor in order to lubricate the various seals
in the loop. This reduces the risk of leaks and
helps to maintain the system performance.
g
Irrespective of the type of circuit, it is essential
to operate the compressor for at least 1 or 2
minutes per month all year long.
It is essential to check the sealing of the A/C loop
during servicing operations.
Valeo has a range of tools to test sealing and
detect leaks.
Warning!
If a major leak occurs in the system, never refill
with fluid without first identifying the reason and
origin of the leak.
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