A bad smell when the engine is on in a Buick Park Avenue Ultra could indicate several issues, such as a coolant leak, burning oil, or a problem with the exhaust system. Overheating components can emit a burnt odor, while a malfunctioning catalytic converter may produce a sulfur-like smell. Additionally, a clogged air filter or fuel system issues could contribute to unpleasant odors. It's advisable to have the vehicle inspected by a mechanic to diagnose and resolve the underlying problem.
what color is the smoke. What does it smell like?
What does it smell like??
Get an engine computer code read out . Could be a fuel sensor problem or even a mass air flow sensor. It could let you down if you don;t get it repaired.
Assuming that the blower motor isn't on fire, it's probably the heater core. Does the smmoke smell sweet. If yes that's antifreeze. The smoke does smell like anti-freeze. Does this suggest that the heater core is the problem?
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clogged catalytic converter Agreed.......the smell of rotten eggs is an indication you have a problem with your cataltic converter
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Catalytic converters are failing and need replacement.
Have the cabin air filter changed.
Oil that has somehow gotten onto the manifold of the engine will produce this smell. Any oil leak in and around the engine will produce this.
if the smell is coming from the engine compartment it could be the batteries going bad.
sounds like cat is plug