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.
Breathing fumes from antifreeze cannot be good for your health as antifreeze is poisonous. If you are smelling fumes in your car you probably have a heater core leak. I recommedn you have this repaired ASAP. The only fix for a leaking heater core is to replace it. A very labour intensive job that is quite expensive.
you have a bare wire touching on your blower motor
If you smell gas in your 1995 Chevy Cavalier when the heater is on, it could indicate a leak in the fuel system that is being drawn into the ventilation system when the heater is running. This could be due to a faulty fuel line or fuel injector. It is important to address this issue immediately as it presents a potential fire hazard and can affect the vehicle's performance.
exhaust leak or a possible fuel line leak
The relay is bad.
To get the kerosene smell out of clothing can be challenging. The first step is to hang the clothes and let the fumes air out, outdoors if possible. Then you can wash them with a good detergent. Wash as many times as necessary to get the smell out before drying them.
Only reason would be that the heater core is leaking.
More than likely your heater core is leaking. The only fix is to replace it.
Only if you want to smell the fumes all the time. Code says it should be through the roof or above the edge of the roof.
the control cable probably came off the connector
You are likely in an antarctic region.