Both ports should be within a few inches of each other, near the accumulator. At least it is on my 04 Silverado. Can't imagine it being all that different.
It is in the larger of the two AC hoses (low pressure line) from the AC compressor near the firewall. The charge ports are size coded so you can't hook it up wrong when charging.
SOURCE: looking for a wiring diagram for a 1999 GMC Yukon
the wiring diagram for the Yukon covers about 100 pages of a factory service manual, we do not have factory service manuals at fixya, i can direct you to a place to buy one on CD, it is very cheap and will contain all the wiring diagrams as well as repair and tear-down of all the different components of the truck.
http://cgi.ebay.com/ebaymotors/1999-99-2000-00-GMC-Envoy-XUV-Yukon-Repair-Manual-OEM-_W0QQcmdZViewItemQQhashZitem45f54bd184QQitemZ300468130180QQptZMotorsQ5fManualsQ5fLiterature
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