It's behind the driver's side rear tire. I didn't even jack it up to change it, but it would help.
Yes, they came with Dexcool, but most people (like myself) had it flushed for the green stuff. Dexcool will sludge, gel, and screw up gaskets if given the chance. The green stuff won't, plus it costs less.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne