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1993 F150 how much oil (R134 conversion)

cleonard on Tue July 15, 2008 5:32 PM User is offline

Year: 1993
Make: Ford
Model: F150
Engine Size: 4.9L
Refrigerant Type: R134a
Country of Origin: United States

My main question is how much oil should I use in a completely dry system? I seem to remember 8oz, but I'm not sure about that. My other question is how much where. For example 4oz in compressor and 4 in accumulator?

A little background.

The truck is a 1993 F150 with the 4.9L six cylinder. It has the factory AC with the FS10 compressor.

About two years ago my compressor failed. The O-tube was full of metal debris. I picked up a junk yard compressor and did my best to purge the mineral oil. I completely flushed the system. The condenser still had some blockage. I used ester oil, but I don't remember how much. I put on the R134 service ports and a high side pressure switch. I pulled a vacuum for a few hours and charged with R134.

The preformance was poor, but then I discovered that the fan clutch was shot. A new fan clutch and it worked much better than expected. Cooling was good enough even when it was 115 outside. I was surprised due to the minor clog in the condenser. The compressor output pressure was higher than "normal" likely due to the restriction in the condenser. Other than a minor leak everything was fine until a couple of weeks ago when the compressor front seal failed. It was a pretty good failure as the compressor pulley slung oil all over. No doubt as to what failed.

I'm now rebuilding again with a new compressor, condenser, blue O-tube, and accumulator. I know that a parallel flow condenser would be best, but since it worked pretty well before I feel that I will be OK with the stock condenser. I don't really have the cash to get the necessary hoses fabbed anyhow. I plan on flushing the hoses and evaporator again before putting it all back together. I figure that there is still may be some chlorine hanging about so I though it would be best to run ester oil again. Is there much difference between ester oil and PAG oil as far as system lifetime is concerned?

Edited: Tue July 15, 2008 at 6:15 PM by cleonard

TRB on Tue July 15, 2008 7:18 PM User is offlineView users profile

I list the oil capacity at 7 ounces.

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