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Could be a few things. Does it leak antifreeze? if so, fix the part that leaks. If not, you could have coolant mixing with oil inside the engine, which burns it. check your spark plugs. If they are white, you are probably burning antifreeze - fix immediately. your exhaust will smell "sweet" as well if you are burning antifreeze.
it is burning rubber
If this is happening you need to get your furnace serviced by a qualified engineer.
Burning antifreeze via a bad head gasket could do that.
depending on what collor is the smoke. it could be a head gasket blown burning antifreeze or bad rings burning oil
Bad head gasket and/or cracked head.
yes burning oil smokes if the exhaust is clogged the motor will not run so if you suspect a lot of oil in the exhaust the engine needs serviced
Odds are you have blown a head gasket and the antifreeze and oil flow share the same gasket. As the gasket wears, the antifreeze mixes into the oil and vice versa! I suggest replacing your current antifreeze and do a full flush. Test it for a few days and test if you have oil again. A tell tell sign of a blown head gasket is black smoke (burning oil) or white smoke (burning antifreeze ) coming out the exhaust.
possibly a leaking heater core look for antifreeze dripping into the interior of the vehicle. usually it is the core or hose connected to the heater core.
Yes, internal coolant consumption can damage a catalytic converter.
No. Carbon monoxide is a by-product of the burning of gas. If the gas isn't burning, no carbon monoxide is being produced. However, you should be aware of escaping gas and shut-off the gas supply to any malfunctioning equipment. Gas boilers should be regularly serviced, and only serviced by suitably qualified technicians.
you might have a blown head gasket and the coolant is leaking into the cylender and the engine is burning it.