Understanding the A/C compressor compression ratio results.Ī compression ratio of 4.43:1 would indicate to a service technician that the absolute or true discharge pressure is 4.43 times as great as the absolute suction pressure. Overheated oil may turn to carbon and create acid in the system shortening the life of the Automotive A/C system. When compression ratios become too high, the refrigerant gas temperature leaving the compressor rises to the point that oil for lubrication may become overheated. #A c compressor repair shop how toHow to find an automotive compressor problem, before is too late?Ĭompression ratios are used to compare pumping conditions for a compressor. The measured temperature must be < 16 ☌ / 60.8 ☏ and the difference between right and left may not be greater than 2 ☌ / ☏. Close remaining flaps (air outlet only from center fresh air grille, left and right)Īfter 5 min, measure both ventilation temperatures with a thermometer at the same time (center, left and right fresh air grille).Stratification maximum cold(4 blue bars).
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