Esther 100 oil for 134a conversion

[ChrisF]

Where do you get this stuff?

 

[turbodave231]

Why use ester? GM recommends PAG oil for all R-134A conversions. Drain out as much mineral oil as you can from the accumulator and compressor and add 8 oz of PAG.

Pull a deep vacuum and charge with 90% R-134A of the specified R-12 charge.

Good Luck-Stay cool:biggrin:

 

[aminga]

Why use ester? GM recommends PAG oil for all R-134A conversions. Drain out as much mineral oil as you can from the accumulator and compressor and add 8 oz of PAG.

Pull a deep vacuum and charge with 90% R-134A of the specified R-12 charge.

Good Luck-Stay cool:biggrin:

Yes on the PAG Oil your local auto parts store should have some. But the 90% charge thing is old advise and will yield a system that doesn't cool well at all. Find a P-T (Pressure Temperature) chart for R-134a and charge to those pressures.

Charging to 90% by weight will get you R-12 like pressures unfortunately R-134a won't cool at those pressures.

But while you're doing the conversion and have the system down you may want to change the o-rings to out. There are newer o-rings that seal better with R-134a. They're green in color.