Have you checked the radiator cap to ensure it is opening at the
correct PSI? Also,
a correct antifreeze/water mixture will raise the boiling tempurature
to the proper tempurature.
I would also suggest checking the thermostat as you mentioned.
One final item. Since your Breeze is a 1997, has the head gasket been
replaced with the multi-layered "MLS" gasket?
If there is a leak in the gasket, the exhaust can force coolant back
into the recovery bottle. Eventually, the cooling system will be low.
This happened on my 1990 Dodge Spirit with a 2.5L engine.
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