I presume the coolant level hasnt changed? (obvious first thing to check)
Also whilst off, how easy is it to replace the Crankshaft seal in the front cover.
Hi, just replaced my oil seal, 4.6 Thor, done mine whilst cover was still attached to engine so will be apiece of cake with front cover off. Gently remove old seal being mindful not to score where seal sits, give area a good clean then apply small amount of grease an gently tap new seal into place with large socket or the like.
HTH Paul.