| Layout of components of refrigerant circuit and their influence on high-pressure and low-pressure sides |
| High-pressure end: Condenser, receiver and restrictor or expansion valve to separate the high and low-pressure liquid ends. |
| High pressure results from the restrictor or expansion valve forming a constriction and causing the refrigerant to accumulate, thus leading to an increase in pressure and temperature. |
| Excess pressure occurs if too much refrigerant or refrigerant oil is used, the condenser is contaminated, the radiator fan is defective, the system is blocked or in the event of moisture in the refrigerant circuit (icing-up of restrictor or expansion valve). |
| Low-pressure end: Evaporator, evaporator temperature sensor and air conditioner compressor to separate the high and low-pressure gas ends. |
| A drop in system pressure can be caused by a loss of refrigerant, the restrictor or expansion valve (constrictions), a defective air conditioner compressor or an iced-up evaporator. |
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| Mechanically driven air conditioner compressor → Chapter |
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| Electrically driven air conditioner compressor for hybrid vehicles → Chapter |
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| Refrigerant line with internal heat exchanger → Chapter |
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| Quick-release couplings on refrigerant line → Chapter |
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| Pipes and hoses of refrigerant circuit → Chapter |
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