| Distribution of the refrigerant circuit components and their influence on the high-pressure and low-pressure sides |
| On the high-pressure side, there are the condenser, the receiver and the restrictor or expansion valve that acts as the separation between the high-pressure fluid and low-pressure fluid sides. |
| High pressure is created because the restrictor or expansion valve forms a restriction and holds back the refrigerant, leading to increased pressure and temperature. |
| Excessive pressure results if the circuit is filled with too much refrigerant or refrigerant oil, or the condenser is dirty, the radiator fan is defective, there is a blockage in the system or there is moisture in the refrigerant circuit (causing the restrictor or expansion valve to ice up). |
| On the low-pressure side, there are the evaporator, the reservoir, the temperature sensor for the evaporator and the air conditioner compressor that acts as the separation between the high-pressure and low-pressure gas sides. |
| A loss of pressure in the system can be due to loss of refrigerant, restrictor or expansion valve failure (not creating a restriction), defective air conditioner compressor or an iced-up evaporator. |
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