Engine compartment gas leak. Repair immediately.
http://www.autozone.com/servlet/UiBroker?UseCase=S001&UserAction=viewSimpleDiagInfo&Parameters=info
**When this suddenly happened to us, my husband found that the oil filler cap had popped off. Luckily it was still under the hood, and as soon as he replaced it, the problem cleared up.
No, they do not. If you smell ammonia it is not coming from the heater unless something has been put inside the heater and is burning.
The unusual smell coming from the heater may be caused by dust or debris burning off the heating elements.
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.
A burning smell from your water heater could indicate a problem with the heating element or wiring. It is important to turn off the water heater and contact a professional plumber to inspect and repair it to prevent any potential hazards.
The burning rubber smell in the tranmisson breaking apart inside.
Because it is burning.
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.
you probably have a bad heater core.
A strange smell from your heater could be due to dust burning off when the heater is turned on after a period of inactivity. It could also be caused by a buildup of dirt or debris in the heating system. If the smell persists or is accompanied by other symptoms, it is best to have a professional inspect and service your heater.
The belt is burning up and wind is pushing the smell through the air conditioning.
the heater core may be plugged up
If you notice a burning smell coming from your water heater, it is important to immediately turn off the power or gas supply to the water heater and contact a professional plumber or technician to inspect and repair the issue. Ignoring the smell could lead to a potential fire hazard or other safety risks.