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I have finally completed installation of a new heater core which involves removing the entire ECC including the evaporator, the job was brutal but it's done. It was necessary to drain the R134. No oil came out with the freon. I am now installing a new receiver/dryerand because the system was open for over a week. Upon removing the old dryer I discovered that there was no oil in it. Just a light coating inside it. There was also no oil in the evaporator. It was my plan to replace the same amount of oil that drained out from these 2 parts. Is this normal? Does this mean that the system is low on oil or is it residing somewhere such as in the compressor or condensor. Should I add some oil as a precaution? AC did work fine before I started the project.
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David Hunter
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