[2002windstar]

You should be able to start re-filling your coolant without an issue, same if you changed your oil.

As for the actual starting, I did wait overnight till I started the engine and bring it up to temp, no leaks presented themselves and just had to top off the coolant once, Although it is not being driven for any distance until I get an idle/timing/backfire issue resolved.

Waiting can't hurt but may not be necessary, sorry I can't give a more definitive answer.