Refrigerant Circuit Components Overview
Refrigerant Circuit Components Overview
• Repair work on refrigerant circuit, refer to => [ Refrigerant Circuit, Repairs ] Refrigerant Circuit, Repairs.
• All work or components marked with 1) can be repaired, replaced or performed in any workshop (work that does not pertain to refrigerant circuit).
• All parts or work on the refrigerant circuit not identified with 1). as well as all refrigerant hoses and refrigerant lines can only be repaired or replaced in a workshop equipped with the necessary tools and where the procedures are performed by qualified personnel (the refrigerant circuit must be discharged).
HD = High-pressure end
ND = Low-pressure end
1 A/C Compressor Regulator Valve (N280)
• Checking activation and function. Refer to=> [ A/C Compressor Regulator Valve (N280), Checking Switch-On Signal ] A/C Compressor Regulator Valve (N280), Checking Switch-On Signal 1).
2 A/C Compressor
• Remove A/C compressor from and reinstall onto the bracket (4 or 6 cylinder engine). Refer to => [ A/C Compressor, Removing From Bracket ] A/C Compressor, Removing From Bracket 1).
• A/C Compressor, 5 Cylinder, removing from and installing on bracket. Refer to => [ A/C Compressor, Removing From Bracket ] A/C Compressor, Removing From Bracket 1).
• When installing refrigerant lines/hoses and pertaining bracket, make sure there is a sufficient gap between belt, bracket and belt pulley.
• Depending on time period of production and on engine, compressor construction type may vary. Refer to Electronic Parts Catalog (ETKA).
• At the start of production, the A/C compressors manufactured by "Denso" (type "6 SEU 14") were installed. A/C compressors from other manufacturers (for example "Sanden", type "PXE 16" or "ZJX") can be installed later.
• These A/C compressors are available as replacement parts with different oil fill capacities, therefore note capacity on the A/C compressor and the exact part number. Refer to the Electronic Parts Catalog.
• Depending on A/C compressor type, different refrigerant oil fill capacities may be designated for the refrigerant circuit. The reason for the different oil capacities in the A/C compressor for an otherwise identical refrigerant circuit is the design of the compressor. Observe these oil capacities. Too much oil in the circuit leads to higher pressures and reduces cooling performance of the system. Too little oil may lead to lubrication problems in the compressor.
3 Belt Pulley
• Replace 1). Refer to=> [ A/C Compressor Belt Pulley, Replacement ] A/C Compressor Belt Pulley, Replacement.
• Ribbed belt, removing and installing 1).
• Ribbed Belt Routing. Refer to Electronic Parts Catalog (ETKA).
• There is an overload protection installed between the belt pulley and the A/C compressor input shaft to protect the belt should the A/C compressor get blocked or be difficult to move.
• If the A/C compressor is runs with resistance, the overload safeguard interrupts the supply of power to it.
• Rubber elements are installed between belt pulley and A/C compressor driveshaft, vibrations which may occur during A/C compressor operation may be dissipated via these rubber elements (damper function at torque fluctuations).
• Different versions of the pulley are installed depending on the type of A/C compressor and engine. Refer to the Electronic Parts Catalog and => [ A/C Compressor Belt Pulley, Replacement ] A/C Compressor Belt Pulley, Replacement.
• The A/C compressor on 5 cylinder vehicles have 2 ribbed belts. The A/C compressor has a belt pulley with a double belt guide.
4 Oil Drain Plug
5 Pressure Relief Valve
6 Connection With Valve
7 High Pressure Sensor (G65) 1)
• Removing and installing, refer to => [ High Pressure Sensor (G65) ] Service and Repair.
• Checking signal, refer to=> [ High Pressure Sensor (G65), Checking Pressure Signal ] High Pressure Sensor (G65), Checking Pressure Signal.
8 Condenser
9 Fluid Reservoir
• Fluid reservoir is mounted directly on the condenser.
10 High Pressure Side Service Connection
• Different versions (with primary sealing valve or with Schrader valve) depending on refrigerant line, distinguishing characteristics.
• Depending on engine version, it may be necessary to remove some components (for example, EVAP canister) in order to be able to connect to service coupling.
Only remove service connections when the refrigerant circuit is empty. The connection does not have a valve.
11 Sealing Cap
• With a seal
• Always screw on
12 Expansion Valve
13 Evaporator
14 Low Pressure Side Service Connection
• Depending on engine version, it may be necessary to remove some components (for example, EVAP canister) in order to be able to connect to service coupling.
Only remove service connections when the refrigerant circuit is empty. The connection does not have a valve.
15 Sealing Cap
• With seal
• Always screw on