These are great replies. Thanks a bundle. And you're absolutely right about the search usually, but this time, I for some weird reason, wasn't turning up enough of a detailed answer to get rid of my confusion. This probably is an indication of my confusion, not others' posts.
Now I have to go away and think about all this.
I've been intending to change the engine mounts...just on principle as a lot of the rubber things seemed nearly shot. And I'll check the radiator tonight.