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you can purchase retro kit at your local parts store. Be sure to follow the instructions. If you mix r134 with too much r12 oil it will copper coat the system and lock up the ac compressor.

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โˆ™ 2015-07-15 19:50:19
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Q: How hard is it to change an R-12 AC in a Blazer to the new coolant?
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It came out with R12 and needs to be converted for R134. DON'T MIX THEM. My car with 134R cools as well as any car with R12. I switched my '92 Blazer S-10 over and have been very happy with it.

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