HVAC 47 B. FLUSHING OF AC SYSTEM Whenever there is an AC compressor failure the AC system should be flushed. This is done in order to remove the debris of the AC compressor that might have circulated through the system. The compressor used in this vehicle is a scroll type which does not have any parts rubbing against each other as compared to a reciprocating compressor. However it being the only moving component in the system, when it fails internal part might get circulated throughout the system. Flushing can be either done using an inverted decanting R134a cylinder filled with refrigerant. In some recovering devices a flushing port is provided. NOTE If a compressor is replaced without flushing, debris would circulate throughout the system. Hence all the components should be flushed. Flushing also removes excess oil from the system. If you suspect the system contains too much oil, flushing is a way to start fresh so you can establish the correct quantity of refrigerant oil in the system. Following points should be noted while performing a flushing process 1. Flush individual components. 2. Self made flushing fitments will be required as AC system component fittings all differ in size, shape and thread size. 3. When replacing air conditioning parts with new ones, it is necessary to replenish oil by approximately the same amount which was left in each part. 4. Reverse flush the components. 5. Do not flush through a compressor otherwise possible internal damage could occur. 6. Recycle the refrigerant recovered during flushing; the recovery device will remove contaminants through a filtration system. NOTE Be sure to use specified compressor oil only.
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