Explorer core/freeze plug developed a sudden 3/16" diameter hole leading
to engine overheat.  Shop says that following core plug replacement the
engine is failing a block test and they claim that combustion gases are
making their way into the coolant.  After cooling down and being towed
home it ran fine when I filled it up with water and made the short dash
over to the shop.

vehicle is 110k miles, ok condition, but probably needs an A/C tuneup
and has a few other minor issues.  Some of the trim on the exterior is
either peeling or faded.  I'm probably looking to not pay to have it
fixed, but trade it in and buy a replacement.

I'm going to get the car back tomorrow and I think I'll drive it some
this weekend to see if I can confirm there is a leak.  I know the guys
that own the shop and they are probably telling me the truth.

1.  Has anyone had any luck getting some help from the factory in
dealing with a significant engine issue this long out of warranty?

2.  I won't sell this car to an individual, but looking for thoughts /
suggestions as to what I should/need to tell a dealership when trading
in on the overheat and presumed engine/coolant leak.

3.  I like the fact that the Explorer has the fold out rear seat for 2
extra people on occasion.  I've only just started researching
replacement options and looking for vehicles with 5 +2 seating.

Thanks,

Gary