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

Volkswagen Golf Service & Repair Manual / Air conditioning system with refrigerant R134a / General information on refrigerant circuit / Electrical components not installed in refrigerant circuit / Pressures and temperatures in the refrigerant circuit

WARNING

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:

Identification of Denso heater and air conditioning unit
Note Pay attention to correct assignment when replacing components. The combination of different makes of component is not permitted → Electronic Parts Catalogue. – Remove left centre console trim ...

Removing and installing wiper blade
Caution Risk of damage to the wiper blade. Joint-free wipers are very flexible. To lift the wiper blades off the rear window, touch them only in the area in which the wiper blades a ...

Checking systems with an expansion valve, receiver and air conditioner compressor regulating valve -N280- (with externally regulated air conditioner compressor)
Note Connecting air conditioner service station → Chapter. Observe the test prerequisites → Chapter. – Raise engine speed to 2,000 rpm. ...