VW Golf manuals

Volkswagen Golf Service & Repair Manual: Pressures and temperatures in the refrigerant circuit

When working on the refrigerant circuit, observe generally applicable safety rules and the Regulations for Pressure Tanks.
The pressures and temperatures in the refrigerant circuit depend on the momentary operating conditions (e.g. engine speed, speed 1, 2, or 3 of radiator fan, engine temperature, whether air conditioner compressor is on or off) as well as environmental influences (e.g. ambient temperature, humidity, required cooling output).
In vehicles with air conditioner compressor regulating valve -N280-, the pressure on the low-pressure side is varied by activating the valve.
Therefore, the values given in the following tables may only be considered as guidelines. They occur at an engine speed of 1,500 to 2,000 rpm and an ambient temperature of 20°C after about 20 minutes.
The locations of connections provided for pressure measurements can be found in the vehicle-specific coolant circuits.
→ Rep. gr.87
At 20°C and with the engine stopped, the refrigerant circuit will adjust itself to a pressure of 4.7 bar positive pressure → Chapter.
Evaporator output temperature sender -G263- or evaporator temperature sensor -G308
Function: The evaporator output temperature sender -G263- or evaporator temperature sensor -G308- reads the temperature downstream from the eva ...

Refrigerant circuit with expansion valve
A- low-pressure side of the refrigerant circuit. B- high-pressure side of the refrigerant circuit.         ...

Other materials:

Safety precautions when working on cooling system
Risk of scalding due to hot coolant The cooling system is under pressure when the engine is hot. Hot steam/hot coolant can escape - risk of scalding. –  Wear protective gloves. –  Wear eye protection. –  ...

Removing and installing driver side interior locking button for central locking system -E308-
  Note The removal and installation procedures are described for LHD vehicles. Removal and installation for RHD vehicles are similar. Removing –  Remove exterior mirror adjuster -EX11-  ...

Without needing to purge refrigerant circuit of contaminants (cleaning), e.g. in cases of external damage after an accident
Drain refrigerant circuit. –  Remove air conditioner compressor.   Note If a different air conditioner compressor with other refrigerant oil is fitted, purge the refrigerant circuit with R134a r ...

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