Could be many things. Can't say exactly what. But, here are a few things I would check. Do you have trees in the area you park your car? If so, you could have leaves pine needle or other dibree in you heater vent that could have caught fire from your heater motor. I actually had this happen once, it filled my pickup cab with wood smoke. It smelled like that every time I used the heater until I sold the truck. You heater core could have a leak and the antifreeze smell could be coming through your vents. Or your heater motor itself could be going bad and melting the winding on the motor armiture. I'm sure there could be other things like electrical shorts, lost cigar behind the ashtray. Hope that gives some help.
A burning smell from a car's brakes means that you are braking very hard or there is a electrical short circuit in the car. Another reason for a burning smell may actually be coming from the car's heater.
Several thing scan cause a burning smell from a car A/C. One cause can be that the compressor is burning up. Another possibility is a wiring shortage.
A car heater that smells like burning rubber could be an indication of a belt that is slipping. The slipping belt smell can be drawn in from the engine compartment into the passenger cabin.
If you try turn on the heat and a huge cloud of smoke fills your car, or you can smell burning anti-freeze....then you have a busted heater core.
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.
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.
If the car is a manual and you are riding or slipping the clutch it could be that. Otherwise if you have been real hard on the brakes lately they can create quite a smell aswell.
The possible explanation for the smell may be that the heater core in the vehicle has a slight leak, therefore the smell of evaporating antifreeze will come through the vents until it is all dried up. Solution is to take the car to a garage and get the heater core replaced.
there could be several things, dust in your heater could just be burning a little (normal! not a problem) or your heater core could be burn out and leaking fluid all over where you can't see. but don't take my word for it!
Because your burning your clutch.
The new car burning smell is probably just the oils burning off the engine. As the engine warms up for the first time, it will release a odor that smells like something is burning.
Because some rubber is burning.
It is possible that a car can smell like gas when the heater is turned on for a few reasons. One possible reason that this happens could be a leak in the line.
when changing the oil sometimes oil can be spilled on the engine block. as your engine heats up it causes this smell. it is completely normal
Any smell from the car vents is unrelated to the AC system unless it is an antiseptic smell. Generally, the smells are environmental from your engine compartment, where the fresh air is taken from. If you smell something burning from the vents, then something is heating up to much under your hood. Check your compressor for a worn clutch, or oil leaking onto the exhaust manifold.
New car smell? Maybe because of the leather seats (if you have leather seats..)
there could be a problem with the motor, or a burning glue gun in the car, or your simply crazy
mine did this too. it was my thermostat. it was such a terrible smell and whenever i used my heat in my car i smelled it too. the thermostat is a pain.
Check inside the car undre the dash , check the heater core.
Generally a burning plastic smell in a car indicates wiring getting hot enough to melt the insulation. This is something that should be looked at immediately to prevent a fire.
dryer sheets in the heater vents may help
Leaking heater core
If the heater has a sweet smell it could be that the heater core is leaking engine coolant. When the leak gets worse you will have a wet floor on the passenger side and the windshield will fog up when you turn on the defroster.
Heater core is probally leaking. Should be located under dash on passenger side.