Model: Silverado 1500
Engine Size: 5.3
Refrigerant Type: R134a
Ambient Temp: 90F
Pressure Low: atmos
Pressure High: atmos
Country of Origin: United States
After reading through all of the FAQs and tech tips, I have now confused myself on the oil situation. The system was entirely empty the other day due to a leaky valve on the high AND low side. Those have now been replaced. I went ahead and bought a new AC Delco accumulator, orifice tube, o-ring/gasket kit, 8 oz of PAG-46, 36 oz of R134a, and some aerosol flush. I was reading that it was a good idea to clean the compressor when apart. According to the charts and the compressor which is off of the vehicle, it is a Delphi unit and holds 8 oz of PAG-46 oil. Now, the compressor was replaced a few years back by an air conditioning shop, and I believe it to be functioning properly but I want to make sure the proper oil is in the system, in the proper locations, and in the proper volume.
There is a sight glass on the back of the compressor. Do I open this and drain the oil? How much to I put back in, the 2-3 oz? Do I run 2-3 oz at a time through the suction port and spin the compressor by hand? Does this leave residual oil in the system, or mostly just go in and out through the compressor? Does that count towards the total amount in the system of 8 oz? If not, then I have 2-3 oz in the back plug of the compressor and I add the rest to the accumulator, 5-6 oz? Then just add the specified 29 oz of refrigerant after proper moisture removal and vacuum procedures?
Confusion is stemming from all of the places adding oil and I am not sure what mixes with the system and what doesn't when it comes to the compressor. I just want some clarification before I start this back up in the morning.
I am about to start flushing the evaporator and condenser. I plan to start flushing the condenser in reverse. If anyone is familiar with these systems, which I am pretty sure some are, I think the manifold that connects to the compressor, is a muffler assembly, so I would be risking my sanity to flush those lines, but I can flush the line from the condenser to the evaporator. Someone help me clarify this as I am under the gun here and about to get started.
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