Well if the head gasket was just replaced and you still have the issue, I'd be asking the guy who replaced the head gasket.
Did he check the block to head surface to be flat and no porosity?
Did he check the head for cracks, flat surface?
Here's a maybe just maybe fix did you use a GM 180 degree T-stat, often after market stats are known to not open or close to keep the computer happy!

 

How do you ascertain losing pressure?
I recently had to replace that rubber plug on the extra output of the t'stat housing because it had a hole in it.

 

Latest update:

The local mechanic let the engine cool down. And it stopped losing pressure. Which as he told me means cracked block or head. How ever the head was just sent off to the machine shop for a resurfacing and pressure test and every other test and it was fine. Which means that the engine has to be the culprit.

The t-stat like said before is 180, its all they sell around here for my car from every parts house I called.

 

Yes you said 180 but did not specify brand name, many have found the GM T-stat to be the best for the computer to work with

 

Its a Murray t-stat.

 

Most likely the problems! Bet it opens at a bit higher temperature

 

Not when I am hearing a bunch of water pouring through my heater core. And most definitely not the issue when its vacuumed it bubbles again and no issue with overheating until too much coolant is lost.

 

vapinhhr707 - your two threads have been merged to keep the info together.

What was the result of your discussion with the place where you bought it regarding the warranty?

Typically you won't hear water pouring thru the heater core - but you may hear air bubbles.

You really need to take it to a good mechanic - you have way too many variables and changes in the story, or new revelations, for anyone here to really help you out over the internet.

This thread is closed unless you can convince me otherwise via a PM.