Volkswagen Polo Service & Repair Manual: Refrigerant Circuit with Restrictor and Reservoir

Volkswagen Polo Service & Repair Manual / Refrrigerant R134a Servicing / Refrigerant Circuit General Information / Refrigerant Circuit with Restrictor and Reservoir

Arrows point in direction of refrigerant flow.

A-Low pressure side of refrigerant circuit.

B-High pressure side of refrigerant circuit.

Refrigerant Circuit with Restrictor and Reservoir

Component	Aggregate state of refrigerant	Pressure bar (psi) positive pressure	Temperature in degrees Celsius (Fahrenheit)
-1- A/C compressor B-side	Gas	up to 20 (290 psi)	up to 70 (158)
-2- Condenser	From gas to vapor to fluid	up to 20 (290 psi)	up to 70 (158)
-3- Restrictor	From fluid to vapor	B-side to 20 (290 psi), A-side greater than 1.5 (21.8 psi)	B-side up to 60 (140 psi), A-side warmer than -4 (25)
-4- Evaporator	From vapor to gas	Greater than 1.5 (21.8 psi)	Warmer than -4 (25)
-5- Reservoir	Gas
-6- A/C compressor A-side	Gas

Pressures on A-side are maintained at approximately 2 bar (29 psi) by “regulating” A/C compressor also at various engine speeds. However, this applies only within the performance range of the A/C compressor; if the performance limits of the A/C compressor are exceeded. Refer to → Chapter „Pressures, Checking“.

Note

In vehicles with A/C Compressor Regulator Valve -N280-, the pressure is modified on the low pressure side by the valve.

Refrigerant Circuit with Expansion Valve

A-Low pressure side of refrigerant circuit. B-High pressure side of refrigerant circuit. Component ...

Pressure Gauge, Tests and Measurements

Indicators on pressure gauge 1 - Temperature scale for refrigerant R134a CF3–CH2F or CH2F–CF3. 2 -&nb ...

Other materials:

Evaporator
Caution Non-approved tools or materials such as leak sealing additives can cause damage or malfunctions in the system. Only use tools and materials approved by the manufactu ...

Checking with Restrictor, Reservoir and A/C Compressor Regulator Valve -N280-, Externally Regulated A/C Compressor
Note Connecting service station. Refer to → Chapter „Connecting Service Station“. Observe test requirements. Refer to → Chapter „Pressures, Checking“. – ...

Switching the front passenger front airbag on and off manually using the key-operated switch
Fig. 58 In the stowage compartment on the front passenger side: key switch for disabling and enabling the front airbag on the front passenger side First read and observe the introductory information and safety warnings The front passenger front airbag must be switched off when securing a ...