The head gasket is blown.
If the car heat has a fresh air setting, then it could be drawing air from outside of the vehicle. The fumes are most likely coming from a problem under the hood.
Could be overheated coolant or just leaked oil burning off your exhaust headers
that could be caused by ur spark plugs missing or something like that i would check ur spark plugs and if not that idk.
Also losing coolant i believe. That would most likely be head gaskets. And hopefully only that.
must be a leak cant think of any other way check all joints and manifold incl lambda sensor failing that cracked cylinder head from exhaust valve but i wudda thought the running would be impaired
That is condensation due to the exhaust system being cold and the heat from the engine makes the exhaust system / pipes sweat. As the exhaust system heats up then that will stop. Now you said WATER not antifreeze. If you had engine coolant running out of the exhaust then it would be the color of the antifreeze and it would be steaming WHITE and then you would have an engine problem, MAYJOR. You said water. Drive it you have no problems. That is normal.
I would be more worried about the foods I eat, do some research on msg! Accidents. Cigarettes and exhaust fumes take years to kill you; some accidents will kill you immediately.
That's exactly what it is, water. The products of combustion are water and carbon dioxide. While the exhaust stays hot the water comes out as high temperature steam, usually you don't even notice it. When the exhaust pipe and/or outside temperature is cold enough the exhaust will cool and some of the water vapor will condense into steam and possibly even water that drips from a weep hole in the muffler. If you're seeing a little water drip from the muffler, everything is working as designed.
One reason would be exhaust fumes may enter the cabin area.
exhaust leak or a possible fuel line leak
Running "Rich" Dirty air filter? Carb. Probably needs adjusting
A blown head gasket could allow coolant to enter the combustion chamber from the water jacket. The coolant probably is running out the exhaust on first start-up. More often, you will notice the coolant being pumped out of the overflow as the exhaust gas pressurizes the coolant. You should look for this symptom when the engine warms up. Coolant in the exhaust on start-up and then the coolant overpressure overflow from the expansion tank or radiator happening together is almost sure indication of the head gasket failure.