You should drain compressor and use Ester oil. Mineral oil and R134A are not 100 percent compatable but will tolerate some left over in system. I always install new filter drier. Sometimes new expansion valve. If cruddy system I flush, if not I just blow it out. Best to use nitrogen to blow as air has moisture in it. Just don't blow through new drier of course. You have to vacuum system to get rid of moisture and air. On those factory 66 series, you need to spend a great deal of time on cleaning the externals of that dirt infested condensor and make sure both fans are working good. Evaporator under roof may be full of dirt also. Have to be sure the evaporator is sealing properly also so air does not just go around in stead of through it.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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