Car overheating, antifreeze missing w/Bar's Leaks head gasket fix

sounds as though it doesn't have enough coolant also did you follow directions

have you car pressure tested to see what's leaking. I had the same problem and thought is was the head gasket of my 03 but found out the radiator had a leak. Replaced it just before I put the stop leak in and have no problems. If the head gasket, look on the internet, there is a special stop leak for north star engines, cost about $180.00. I would change oil and trans fluid after a over heat

Sounds like radiator ... Small water tanks each side are plastic ...they can get hairline cracks ... allow air to get into system I just replaced mine ... no overheat ..no lose of coolant Radiator was $70 E-bay .. new It not easy job ... that's why shop wants $600+ Watch u tube videos ...for basic game plan

Have you checked the radiator if it's old and not letting water run thru it may cause over heating, I went thru it where I changed water pump and thermostat and still over heated, if u think it could be the thermostat u could remove it completely and it will work ,run cold but no damages will come from it other than a little bit of horse power, just to test if it was the thermostat. If still runs hot without thermostat then it's the radiator. But if u have milky oil , result of coolant leaking into the oil, then it's the head gasket which is difficult and expensive to fix. I'd recommend getting a new car, if it's the Head gasket.

Also cars with Northstar engines take special pelets they sell at Cadillac for 7 dollars or so for cooling, these cars take alot of special care.