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Sounds like the coolant is being burned. Likely a bad head gasket. To check for leaks, top off the coolant in the radiator (not the plastic tank) before starting the car in the morning. Start the car and let it run till it reaches operating temperature. Look for leaks under the car and around the heater hose fittings on the tensioner near the fire wall.
The coolant expands most as the engine warms. Had the same problem on a 96 Buick.
Put a pressure tester on it. Lot of leaks that only appear when under pressure are not going to be obvious as they are near something hot enough to evaporate them. Lower intake gaskets had a tendency to leak on these.
I think this is the intake manifold that has an issue with the coolant passage that cools the EGR gases.
It will either crack or burn though in the area of the EGR valve and suck coolant into the intake. I think you have to remove the throttle body to see it.
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