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CONDITIONING
252
CHECKING PRESSURES (continued)
Low pressure
too low
- Insufficient fluid charge.
- Constriction of the HP system.
- Dirty pressure control valve.- Cooling fan speed unsuitable.
- Faulty compressor.- Faulty pressure control valve.
- Faulty compressor.
- Faulty compressor.
- Dirty evaporator.- Circuit normal. - Cooling fan speed unsuitable.
- Faulty pressure control valve.
- System blocked.
- Water in the system.- Presence of solid matter in the
system.
- Dirty condenser.- Excessive fluid charge.
- Dirty condenser.
- Faulty pressure control valve.
- Cooling fan speed unsuitable. High pressure
too low
High pressure
normal
High pressure
too highLow pressure
normalLow pressure
too high
Checking the pressure at temperatures between 15°C and 35°C for information only.
In general, the pressure should be approximately :
- forR134.afluid, less than 2 Bars(Low pressure), and between 13and 24 Bars(High pressure).
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
