Which valve do I add freon to upper or lower? on 1999 Cadillac Catera

Need to add freon . There are two ports, one on top nearer passenger Compartment and one lower nearer to radiator. Which do I use.

by in North Palm Beach, FL on March 27, 2011
1 answer 1 comment
ANSWER by on March 27, 2011
I would not add any refrigerant if you are not familiar with a/c systems, take to a shop with the correct special equipment to do the job correctly, you can't just FIX a/c by JUST adding refrigerant.
COMMENT by on July 23, 2011
Well, freon can certainly be added if the system is low and fix the cooling problem if that's what the problem is.

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