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How much PAG oil to add for 76 Corvette w/134a?

20mercury on Mon March 31, 2014 4:24 PM User is offline

Year: 1976
Make: Chevy
Model: Corvette
Engine Size: 350
Refrigerant Type: 134a
Ambient Temp: 90
Pressure Low: 0
Pressure High: 0
Country of Origin: United States

Questions for the a/c experts, please:

(From reading posts, I know there are mixed thoughts about using a VIR eliminator, but I thought I would give it a try.)

How much PAG oil to use for a 1976 Corvette conversion to 134a? with A6 compressor, and VIR eliminator setup???

Factory has 10.5 or 11 oz of mineral oil, seen other info on the internet that say to use 8oz of PAG oil, another with 6oz, last thing I want to do is run short of oil on the working A6 compressor. I have taken apart everything and drained compressor and accumulator and cleaned evap and condenser, lines, hoses.

Next, apparently there are different viscosity PAG oils, thought I saw somewhere that the high viscosity, 150, was best for an A6 compressor. Thoughts?

Finally, I have got a used accumulator, looks like a standpipe out the bottom which takes vapors to the compressor and side entry from the evaporator, can I just stuff a new desiccant bag in the accumulator entry hole from the evaporator??

Much thanks! (BTW, I also need a 10year old with long arms to hook up the a/c lines without cross threading the connections)

Edited: Mon March 31, 2014 at 9:58 PM by 20mercury

mk378 on Tue April 01, 2014 8:58 PM User is offline

Use the same amount of oil as stock. If you're using PAG in a conversion, double end capped is better than regular. You could consider POE oil because it is compatible with both refrigerants-- you have the option to revert to R-12 without needing to flush out and replace all the oil. The A6 has an oil plug in the side, remove and replace oil there. Make sure your desiccant is 134a compatible.

TRB on Tue April 01, 2014 9:07 PM User is offlineView users profile

Depends on the compressor. The older A6 will take close to 11 ounces. The newer alumium replacement A6's take around 8 ounces depending on the system they will be used on.


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20mercury on Wed April 02, 2014 12:49 PM User is offline

Much thanks for the feedback, this is the older A6, pretty heavy, does not seem to be aluminum anywhere, so will put in 11oz as per you say.

Also thanks for the tip on the oil drain plug, good to know.

Appreciate the help, thanks!

northernbeach on Fri April 11, 2014 2:48 AM User is offline

I think it totally depends on AC compressor. Thanks for this information.

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