Posibilities are head gasket. Coolant can get into one of the cylinders and will be evaporated and sent out the exaust. If tyhe leak is bad enough it can cause a miss fire on that cyld . If you take the plugs out the faulty cyld will have a white coulour to the plug electrod. Also check heater core . Could be leaking and evaporating the fluid into the passanger area. Usually when this happens you can smell coolant and sometimes the windshield will steam up with the defrosters on.
actually on the 3.4 liter, it's more likely to be a lower intake manifold gasket leak, it's very common for that engine (happened to me), and for the 3.8L, the plenums are famous for cracking and leaking coolant into the intake system (also happened to me). Both are very common and happen to these engines often.
Yes I forgot about the intake leak common to the chev . Very well could be .
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