Bentley Volkswagen.Golf.Jetta.R32.Official.Factory.Repair.Manual.1999-2005

Pressures, checking on vehicles
Página 12 de 33
High pressure side:
Increasing from initial pressure (on
connecting pressure gauges) to
max. 20 bar.
Low pressure side:
Decreasing from initial pressure
(on connecting pressure gauges)
to value in graph.
A - High pressure in bar
B - Low pressure in bar
C - Permissible tolerance range.
Possible deviation from
specification
- High pressure remains constant
or only increases slightly (above
pressure with engine stopped),
- Low pressure quickly drops to
value in graph or below,
- Required cooling output is not
attained.
- High pressure normal,
- Low pressure in line with value in
graph,
- Required cooling output is not
attained.
Note:
- If no malfunction can be found
and air conditioner operation is not
OK when test is repeated, flush
refrigerant circuit with compressed
air and nitrogen.
Possible cause
Not enough
refrigerant in
circuit or
expansion valve
malfunctioning.
Corrective action
- Extract refrigerant from
refrigerant circuit.
- If quantity of refrigerant extracted
roughly corresponds to specified
capacity:
- Replace expansion valve.
- Re-charge refrigerant circuit.
- Repeat test.
- If quantity of refrigerant extracted
is substantially less than specified
capacity:
- Localize leak using leak detector
and eliminate.
- Re-charge refrigerant circuit.
- Repeat test.
Possible deviation from Possible cause Corrective action
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13/2/2005