July 23, 200619 yr does anyone know how much oil to put in the compressor.I believe I gave this reference previously, but for some general info, see: http://endwrench.com/images/pdfs/ACSystems.pdf However, if this is all about the compressor knock, you should know that a cause of knocking with axial-piston type compressors (used on early-90's Subarus) can be refrigerant pressure that's too high. That could be due to an overfill, or a restriction (possibly caused by icing from moisture, etc). That's why I wrote before about evacuation and the drier condition. Normally when you replace oil in the compressor, you dump what's in it and put the about same amount in as was removed. That's because the spec is for the entire system, but unless everything is new there's oil distributed throughout (especially some concentrated in the receiver/drier), and putting the spec amount in the compressor would typically overfill a previously-used system.
July 23, 200619 yr Author why did they use more that one type of system. my 90 4wd and my g/f's dads car are identical except for color. they even have the same options. they were both built 5/89. why do the lines mount on different places on the pump and the condenser.
July 23, 200619 yr Are their VIN's similar? Does yours start with 4S4 and her dad's start with JF1 or vice-versa? That could make a difference.
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