As per Peter..."Expect to replace a bolt or two on the thermostat housing of it was leaking at all, the bolts are small and sieze pretty easily. "


Amen, brother. You may want to acquaint yourself (check archives) with some of the techniques for dealing with the broken bolt. The new Sears left hand stud "socket" (for those with a bit of shaft still available) and/or left hand drill removers seem to be the current favorites. I wouldn't worry much about it, because odds are yours won't break, but it will give you peace of mind to know that others have always succeeded in removing them, one way or another.

__________________
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)