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Q: Bubbles in Coolant Expansion Reservoir on 1998 Ford Ranger

I recently flushed they system and changed the thermostat. There is no coolant loss from hoses, water pump or otherwise. Only bubbles after I turn the car off (will not bubble while running). Can't see / smell anything abnormal in the expansion tank. Seems to be extra pressure in radiator after car has cooled... When I open the cap it does not smell like coolant (sweet).
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It may just be air trapped in the engine from the coolant flush. Is everything else normal, the temperature OK and is the coolant level dropping?
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