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Geely CK (2008). Manual part - 79
313 Section 7 A/C System Faults Check & Troubleshooting I. A/C System Faults Check Inspection shall be made to isolate the fault area and its cause when the fault of A/C system occurs, and then specific service could be performed. Inspect the whole system before re-using A/C system after a long term of storage. First step is initial inspection by direct "see, listen and touch". Test the system with the leak detector if necessary. 1. Check the Refrigeration System Under the normal condition, the low pressure pipeline of the A/C refrigeration system takes on a status of low temperature and the high pressure pipeline takes on a status of high temperature, see Figure 16. Based on this rule, you can arrive at the initial judgement about the fault area and its cause by touching the refrigeration system pipeline and elements to feel the surface temperature with your hand. 1 High pressure area: compressor outlet condenser receiver/drier expansion valve inlet, its temperature change trend is from warm to hot. If the temperature change is not this trend, but instead some part is extremely hot (e.g. condenser surface), it indcates that the part is faulty and the radiation is not good; if some part is extremely cold (e.g. receiver/drier) or there is frost (e.g. at expansion valve inlet), it indicates that the part is faulty and the pipe may be blocked. 2 Low pressure area: expansion valve outlet evaporator compressor inlet, its temperature change trend is from cool to cold, If the temperature change is not this trend, it indcates that the part is faulty. 3 Compressor: compressor inlet and outlet high & low side shall have apparent feel of temperature difference, if there is no temperature difference, it indicates that there is leakage in the system and the refrigerant has leaked. 2. Check the Leakage Area 1 Observe all connecting areas of the refrigeration system or condenser surface for oil stain, if there is oil stain, it indicates that the the refrigerant is leaking (refrigerant and freezing oil leak simultaneously, refrigerant volatilize after leakage and leave the freezing oil remained to be oil stain). 2 Apply the soap water to the connecting area, if soap bubble occurs, it indicates that there is leakage. 3 Check with instrument, the common instrument is halogen leak detector. When using the halogen leak detector for check, the key is the propane flame color depending on which the judgement is made. When there is no leakage, the flame color remains unchanged, when there is a little leakage, the flame is greenish, when there is large leakage, the flame is bluish or purple. Cool Cold Hot Warm Expension Valve Compressor Evaporator Condenser Gas Gas Liquid Liquid Low Pressure High Pressure Figure 16 A/C System Process → → → → |