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Your mechanic needs to figure out where the coolant is going. If it is not showing up under the car or on the floor mats in the car, then the problem may be either a leaking head gasket or in your radiator. If it is the radiator, coolant may be getting into your engine oil and this is very serious.
the smoke is probably coolant steam and the sweet smell is the unique aroma of engine coolant (anti-freeze). check the carpets, they may be wet with coolant. most likely a heater core failure.
Your heater core has developed a leak (of coolant). The smell is the "sweet" smell of ethylene glycol, a component of engine coolant. The white smoke is steam coming from the heated coolant evaporating. The coolant is dripping into your duct work under the dashboard, and apparently being evaporated out of the ductwork and sent into the passenger compartment, meaning its a small leak. When the leak gets worse, you may get wet carpet on the front passenger side.
Are you sure it's smoke? Usualy this is steam from a ruptured heater core. If so you are loosing coolant into the heater ducting and it will eventually overheat. If it is steam from a bad heater core it will smell like anti-freeze.
Sounds like the heater core is leaking coolant. If it is leaking it will blow steam out of defrost vents and fog the windshield. Symptoms: low coolant level in radiator, steam coming out vents when engine is warmed up, odor of anti-freeze coming out of vents, wet carpet in floorboard near heater blower motor. If so, replace heater core.
A car this new should have a warranty right? the only other place for anti-freeze to go is through a blown headgasket into your oil. Pull out your oil dipstick and make sure it is not milky in color. If not check behind the engine and see if any coolant lines going into the firewall are leaking. When inside the car do you smell steaming coolant(anti-freeze) or hear gurgling? The temp gauge that stays on is the overheat indicator?
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