That could be a leaking exhaust system. A leaking exhaust system is very dangerous! Please have it checked out ASAP.
Something is wrong with the catalytic converter.
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
Car exhaust can smell like rotten eggs when the fuel has a lot of sulphur in it.
A car may smell like sweat due to gym clothes, or other workout clothes, being left in the car.
The new car smell is caused by the combination of materials found in new automobiles. The adhesives and sealers used when a car is first manufactured release volatile organic compounds in the air afterward, leading to the smell.
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.
It makes your car smell somewhat new, but be careful as too much will make it smell like a cab, unless of course you want to go for the cab smell.
There are a few reasons why your car might smell like fish. Fish could have been at one point stored in the car.
This is called THE NEW CAR SMELL. This is what all new cars smell like. It is a mix of all the new materials that go into a new car.
because your engine is going to break down or when you start the car if the whether is cold, it makes it smell like gas
Defrost uses the a/c, if it doesn't smell the same with a/c only on. The smell is coming from the blower motor. Bmw's for example have a problem where the blower blade contacts the plastic housing and causes it to rub/melt.
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.