Check between the cylinder head and intake manifold, see what color the intake gasket is. If the color is still black, then it's possible that the LIM gasket have not been done and that the cooling passages are blocked up from previous use of old dexcool coolant.

Other things that leak are the coolant elbows, they may not drop puddles on the ground but they are super common to leak and cause the coolant smell.

Water pump fins could be gone too, they wear away from corrosion with old dexcool.

If you had a head gasket failure this motor would overheat way faster, have white smoke from the exhaust.