I've replaced the one in a '93 Taurus and then more recently in the '97 Safari.
Not very difficult. Didn't tighten one of the trans cooler lines quite enough, caused a mess by the time I realized it.
Ordered from Radiatorbarn.com both times. I recall the rad costing maybe $120. I have NEVER replaced Rad hoses on the Safari (but it probably wouldn't be a bad idea. You'll need Coolant, not much else that I can think of.
I did eventially replace the Oil Cooler lines because they leaked at a joint (not the connections).
For the Safari, I have the Shop Manual. Toughest part was wiggling the two halves of the plastic shroud out and back in. You might want to be sure to have the specific instructions for the Yukon before starting, but really not much to it.
If you have to remove the fan, it could get tougher, wasn't necessary for the Safari.
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