It's probably the dreaded intake gasket leak. Check your engine oil. See any creamy substance in the oil? Either on the dipstick or in the valve cover?
If not, look around the throttle body and see if those lines are leaking on the exhaust manifold. It will burn off the coolant pretty quick without leaving puddles.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne