CITROEN XANTIA User Manual page 299

ALL TYPES
High pressuretoo low
High pressurenormal
High pressuretoo high
Checking the pressure at temperatures between 15°C and 35°C for information only.
In general, the pressure should be approximately :
- for R134.a fluid, less than 2 Bars (Low pressure), and between 13 and 24 Bars (High pressure).
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
CHECKING PRESSURES (continued)
Low pressuretoo low
- Insufficient fluid charge.
- Constriction of the HP system.
- Dirty pressure control valve.
- Faulty compressor.
- Dirty evaporator.
- Faulty pressure control valve.
- System blocked.
- Water in the system.
Low pressurenormal
- Cooling fan speed unsuitable.
- Faulty compressor.
- Circuit normal.
- Presence of solid matter in the
system.
- Dirty condenser.
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Low pressuretoo high
- Faulty pressure control valve.
- Faulty compressor.
- Cooling fan speed unsuitable
- Excessive fluid charge.
- Dirty condenser.
- Faulty pressure control valve.
- Cooling fan speed unsuitable.