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sounds like an exhaust leak, or a fuel leak. that depends on the smell.
There is nothing that can cause a gas smell from your heater. There are however a few possible reasons why you experience a gas smell. One could be that fumes from the exhaust are entering the passenger compartment.The other possibility is that your heater could be leaking and what you are smelling is coolant or antifreeze as some people call it. The heater consists of a small radiator and a fan, it circulates hot water from the cooling system through the radiator and the fan blows air through the radiator just like the radiator in front of your car. There is nothing that can cause a gas smell during this process. Check to see if your exhaust system does no have a leak by holding a rag over the tailpipe and get someone to listen at the front. The chances are that the fan is drawing in exhaust gas and circulating themn in the passenger area.
You probably have a manifold exhaust leak and the exhaust gasses are being picked up by the heater intake. I guess you could just be picking up exhaust gas from another vehicle though.
A "smell" is added to propane the same as a "smell" is added to natural gas. Some people describe it as being like old cabbage. I can attest that it is not pleasant and unless you have very poor sense of smell you will notice it. Don't ignore it if you do. Propane is heavier than air and will lie in a low area and is very combustible.
Your heater core may have a leak in it, allowing the fumes to invade the inside of the vehicle.
Could be a leak in the manifold, or a hole in the exhaust, and when you stop the car there is no pressure blowing off the fumes, so it floats up into the car.
No they don't smell like anything
It could be your heater fan bearing. But more than likely its something in your engine compartment that is making the smell. Such as oil burning on the exhaust or a worn accessory belt.
Well if you have a hole in your exhaust like rite under your car, it is able for the exhaust fumes to get into your car and kill you ;P
don't ever smell your car's exhaust.
YES! They breathe just like humans!
Barring any fuel leaks I would say that your charcoal canister is probably in need of replacement. they can fill up with liquid after some time making them useless and will smell of gas. Also it may be an exhaust leak if it is not an actual gasoline smell.