88 LeBaron CTS Turbo running hot

[kenlam]

88 LeBaron GTS Turbo 2.2 with about 180K on it. It start with coolant boiling out from coolant collector. Changed radiator cap, samething. Everytime I stop, the coolant will rush out of the collector. Replaced the thermostat today, make sure the coolant is at the right level. it didn't boil over ...yet. But the car is running got, 3/4 on the temp. gauge. Machanic said it might be the head-gasket. But I have it replaced two years ago, should the head-gasket last longer than that? Should I try those "fix-O-Leak" products?
Thanks
Kenny

[J-BODY]

I would say it does sound like a head gasket prob, or in a turbo's case, a cracked head. Find a shop that can perform a "Block test". This tool will tell you if you have exhaust gasses in your cooling system. It uses a chemical that remains blue if it is ok, or turns yellow if it detects gasses.