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amount and type of oil to charge with?

texas71 on Tue June 15, 2010 1:01 AM User is offline

Year: 1971
Make: chevrolet
Model: cheyenne p/u
Engine Size: 350
Refrigerant Type: 134a
Country of Origin: United States

The system has always been as original with r-12 until about 5 yrs ago when I gave up on getting a good a-6 comp. At that time I flushed the system, replaced the expansion valve, drier, checked the POA per the thread on this site for proper operation, and installed a sanden 508 compressor with freeze 12 refrigerant. It worked o/k but not as well as with r-12 and last winter lost its charge due to a hole in the evap. I got a new evap. with accumulator/orifice tube/cycling switch and connections from classic industries and a parallel flow condenser from vintage air and want to retain the sanden 508 can the oil be flushed out of the sanden and replaced? I have read that I need to use the DEC PAG but arent there different weights? How much do I put back in the compressor and do I need to allow any oil for the rest of the system? Am I correct in my understanding that too much oil can hinder cooling? Or is it bad for other reasons? Thank's any and all information is greatly appreciated.

HECAT on Tue June 15, 2010 10:30 AM User is offline

The 508 calls for SP-20 which is PAG-100. Look at the tips and procedures page for how to oil flush a compressor (wash old oil out with new). Do not attempt to solvent flush a compressor. Too much oil can inhibit proper thermal transfer and too little oil will not properly migrate to properly lubricate the compressor (not enough refrigerant will also). How much oil is difficult to say with a hybrid system such as yours; I would guess something like 6 ounces (total) spread throughout the system. Others may offer their thoughts.


HECAT: You support the Forum when you consider for your a/c parts.


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