Volkswagen Golf 1999 Service Manual page 4040

Pressures, checking on vehicles
D - Low pressure (measured at
connection with valve for low-
pressure switch or at service
connection) in bar.
E - 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.
- High pressure normal,
- Low pressure too low (see
graph),
- Required cooling output is not
attained.
Note:
- If no malfunction is found in
relation to this complaint, flush
refrigerant circuit with compressed
air and nitrogen.
Possible deviation from
specification
- High pressure only increases
slightly above pressure with
engine stopped,
- Low pressure only drops slightly,
- Required cooling output is not
attained.
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Next&type=repair&id=...
Possible cause
Not enough
- Localize leak using leak detector
refrigerant in
and eliminate.
refrigerant circuit.
- Re-charge refrigerant circuit.
Possible cause
A/C compressor
- Flush refrigerant circuit with
malfunctioning.
compressed air and nitrogen.
- Replace compressor.
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Corrective action
Corrective action
13/2/2005
- High press
specification
- Low pressu
value in grap
- Required c
attained.