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Where is the low side service port for a/c system?

(1991 Ford Taurus)
in Graham, TX on March 19, 2010
I wan't to charge air conditioner with R-134.
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Popular Answer
on March 19, 2010
Usually the fitting on the can only fits the low side port
on July 28, 2011
your system is an older one. Pre 92' should have been filled and fitted with r12.
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