I retorqued the head bolts yesterday. So far so good, but the weather only got up to around 70 today. While I was working on it, I discovered one of the spark plugs was loose enough to turn with my fingers- probably unrelated to my overheating problem? Can I wait for a few days and have the coolant rechecked for exhaust gases again?

My dad always told me, "Don't force it, get a bigger hammer".