This normally indicates a refrigerant leak. STOP USING YOUR AC IMMEDIATELY AFTER THE ACKNOWLEDGEMENT OF THIS SMELL!! The fumes from the fluid in your AC system are highly toxic. The leak needs to be sorted out before the AC can be used again.
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.
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.
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.
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
New car smell? Maybe because of the leather seats (if you have leather seats..)
Varnish, or in other words it does not smell like gas, it smells almost burnt
your vehicle may smell like antifreeze while driving because it is overheating
because some one egged you.
don't ever smell your car's exhaust.