Refrigerant Circuit System Overview
Refrigerant Circuit System Overview
Special tools, testers and auxiliary items required
• Torque Wrench (V.A.G 1331)
• Hose Clamps up to 40 mm (3093)
• Drip tray for workshop hoist (VAS6208)
• A/C service station (ROB 134APF) or succeeding model.
- When working on the refrigerant circuit, note the information, refer to => [ Refrigerant Circuit, Specialized Repairs ] Procedures.
1 Reservoir With Dryer Or Dryer Bag
• Under certain conditions, the reservoir and the dryer/dryer bag does not need to be replaced each time the refrigerant circuit is opened.
• Condenser manufactured by Showa: reservoir with dryer, removing and installing, refer to => [ Fluid Reservoir ] Fluid Reservoir.
• Condenser manufactured by Modine: dryer bag, removing and installing, refer to => [ Dryer Cartridge ] Dryer Cartridge.
2 A/C Compressor
• Delphi designation: 6CVC 140
• Sanden designation: PXE16
• Denso designation: 6SEU14C; 7SEU17C
• Removing and installing, refer to => [ A/C Compressor ] Service and Repair.
3 Condenser
• Removing and installing, refer to => [ Condenser ] Condenser.
4 High Pressure Sensor (G65)
• Removing and installing, for Gas engine refer to=> [ High Pressure Sensor (G65) ] High Pressure Sensor (G65) or diesel engine => [ High Pressure Sensor (G65) ] High Pressure Sensor (G65).
5 Nuts
• 6 Nm
6 Bracket
7 Evacuating and Charging Valve
• High pressure side
• Environmentally hazardous draining of refrigerant is an offense punishable by law.
• Removing and installing, refer to => [ Evacuating and Charging Valve, Low and High Pressure Side ] Evacuating and Charging Valve, Low and High Pressure Side.
8 Screw
• 3.5 Nm
9 Bracket
10 Evacuating and Charging Valve
• Low pressure side
• Environmentally hazardous draining of refrigerant is an offense punishable by law.
• Removing and installing, refer to => [ Evacuating and Charging Valve, Low and High Pressure Side ] Evacuating and Charging Valve, Low and High Pressure Side.
11 Expansion Valve
• Function and removal and installation, refer to => [ Expansion Valve ] Expansion Valve.
12 Bracket
13 Nut
• 20 Nm
14 Bracket
15 Screw
• 3.5 Nm
Danger due to refrigerant coming out under pressure.
Danger of frost bite to skin and other parts of the body.
• Extract the refrigerant and immediately open the refrigerant circuit after that.
• If the refrigerant was extracted more than 10 minutes in the past and the refrigerant circuit was not opened, extract the refrigerant again. Pressure in the refrigerant circuit is caused by evaporation.
• Refrigerant must be extracted before hand using ROB 134APF.
• The previously used service stations can still be used. Refer to workshop equipment catalog.
• To prevent the entry of dampness all components of the refrigerant circuit which have been opened must be sealed with suitable plugs.
• The color coding of refrigerant circuit O-rings with R134a has been discontinued. Colored and black O-rings are used.
• Under certain conditions, the reservoir and the dryer/dryer bag does not need to be replaced each time the refrigerant circuit is opened.
• ELSA contains all safety precautions regarding performing repairs on vehicles with air conditioning and working with refrigerant.
• Information on tools for repairs in vehicles with climate control system can be found in ELSA.
• When filling and emptying with coolant, the heater and A/C unit refrigerant cut-off valve (N541) and the high voltage battery heater core refrigerant cut-off valve (N542) must be open.
• Use a voltage of 12 V for the shut-off valves when filling and emptying with coolant.