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Q:

filling the ac system on 1991 Lincoln Continental

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I want to recharge the ac system. My questions are 1) is the low pressure connection against the firewall under a plastic housing and 2) Does this car take R134?
(1) Answer
No it does not take R-134a - it takes R-12. R-134a was introduced in cars on January 1, 1993. As far as the ports go, they are located on the hoses that are attached to the compressor.