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73-87 Chevy _ GMC Trucks => Interior & Equipment => Heating, Ventilation & Air Conditioning (HVAC) => Topic started by: 82silverado on June 14, 2024, 03:24:56 pm

Title: Pag or Ester?
Post by: 82silverado on June 14, 2024, 03:24:56 pm

82 silverado. New components throughout. Lines, condenser, evap, drier, compressor. Since there is no mineral oil from R12 should I use pag? And if so which one?

Title: Re: Pag or Ester?
Post by: Shifty on June 14, 2024, 04:14:46 pm

If you've converted to R134a, then pag.  GM uses a lot of 150 weight in the earlier stuff, but if changing to a Sanden, then 100....8 full ounces.   

If you're still running r12, then stick with mineral, ester only if absolutely necessary. 

Title: Re: Pag or Ester?
Post by: 82silverado on June 14, 2024, 05:04:18 pm

Thank you. Glad I asked.  I assumed 46 and bought a couple bottles. Will take them back in the morning. Stock style A6 long compressor.