On Saturday, April 18, 2015 at 12:43:52 PM UTC-4, Oren wrote:
On Sat, 18 Apr 2015 08:56:16 -0700 (PDT), trader_4
wrote:

I can't explain the behavior of why it runs hot at idle in
terms of the leaking headgasket. I'd suspect that there might
be another problem, like blocked radiator, that's the real
problem, even though OP says that has been ruled out. If there
is a separate cooling system problem, that could have allowed
the car to overheat, warp the head, and that's why the head
gasket is leaking. Symptom of partially blocked radiator
can be overheating at idle. With the car not moving, less air
moves through radiator, so it needs more radiator performance
that when it's moving.

[wrench in the cog]

...maybe the T-stat is frozen shut and not working - remove or replace
it. Use the correct temp rated T-stat.

If the thermostat was frozen shut it would be overheating worse
while being driven, instead of only overheating when stopped.