Volkswagen Golf Service & Repair Manual: High-pressure safety valve

Volkswagen Golf Service & Repair Manual / Air conditioning system with refrigerant R134a / General information on refrigerant circuit / Refrigerant circuit components / High-pressure safety valve

The high-pressure safety valve is fitted to the air conditioner compressor or the receiver.

The valve opens at a pressure above approx. 38 bar and closes again when the pressure has dropped (approx. 30 bar).

Not all the refrigerant is lost from the system.

Depending on the version, a transparent plastic disc may be fitted, which breaks when the valve opens.

High-pressure safety valve

Pipes and hoses in refrigerant circuit

The mixture of refrigerant oil and refrigerant R134a attacks certain metals (e.g. copper) and alloys and dissolves certain hose materials. Therefore, always use genui ...

Design of refrigerant circuit

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Other materials:

Sockets in the vehicle
Fig. 125 In the rear section of the centre console: 12-volt socket Fig. 126 In the luggage compartment: 12-volt socket First read and observe the introductory information and safety warnings Maximum power rating Electrical socket Maximum power rating ...

Displays, warning and indicator lamps
Fig. 166 In the instrument cluster display: ACC deactivated temporarily; vehicle detected ahead, time interval set Fig. 167 In the instrument cluster display: ACC active: vehicle detected ahead, time interval is being set First read and observe the introductory information and safety warni ...

Removing and installing coolant temperature sender at radiator outlet -G83
Removing Engine cold – Briefly open cap of coolant expansion tank -arrow- in order to release residual pressure in the cooling system, then tighten the cap ...