Checking The Efficiency Of The Air Conditioning System; Checking Pressures - CITROEN C8 2002 Handbook

CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM

High pressure
too low
High pressure
normal
High pressure
too high
Checking the pressure at temperatures between 15°C and 35°C for information only.
In general, the pressure should be approximately :
- for R134A fluid, less than 2 Bars (Low pressure), and between 13 and 24 Bars (High pressure).

CHECKING PRESSURES

Low pressure
too 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 pressure
normal
- Cooling fan speed unsuitable.
- Faulty compressor.
- Circuit normal.
- Presence of solid matter in the
system.
- Dirty condenser.
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Low pressure
too high
- Faulty pressure control valve.
- Faulty compressor.
- Cooling fan speed unsuitable.
- Excessive fluid charge.
- Dirty condenser.
- Faulty pressure control valve.
- Cooling fan speed unsuitable.