From what I remember one port near firewall in battery area, the other port right side front of the radiator... took me time to trace and find it, and when I did I said "gee's it's right there"..
Please note on a R134 system it is best to get a shop to evacuate the system, hold pressure at a vacuum, then refill.... a top off will work, but as some of the R134 does turn to water, over time repeated top off's without a evac will lead to a inefficient system..
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