I am not happy with the performance of R134A in my 1990 S10. I just found 4 cans of R12 at a yard sale for $30 and wish to convert back. When I converted to R134A it was a complete new system minus the condenser and ester oil was used. I used the blue orifice to help with cooling, but should I go back to the white one with r12, and will the ester work with R12? These older S10s absolutely suck with R134A, so if you own one, do not convert to R134A unless you drive faster than 50mph.
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