I don't think so. Probably your cabin air filter is dirty or the air duct is partially clogged with old leaves and decomposing stuff - that's what happens to me. It might even be a dead animal that crawled up into the engine and died! Anyway, I keep my cabin air filter changed and I use some of the recipes from the following webpage to keep the inside of the car smelling good.
Could be an A/C coolant leak.
Is it a fish smell or a rotten egg smell ? FISH SMELL COULD BE A BAD HEATER CORE, THIS WOULD CAUSE YOU NOT TO HAVE HEAT IN THE CAR , BUT IT MIGHT NOT CAUSE CHECK ENGINE LIGHT TO COME ON UNLESS MAYBE CAR IS LOW ON COOLANT. ( THERE MIGHT BE A LOW COOLANT SENSOR TO TRIGGER CHECK ENGINE LIGHT) ROTTEN EGG SMELL COULD BE A CLOGGED CATALYTIC CONVERTER , WHICH WOULD CAUSE THE OXYGEN SENSOR TO TRIGGER THE CHECK ENGINE LIGHT, BUT IT WOULDN'T CAUSE THE LOSS OF HEAT.
Bravada smell coolant. That's how they greet each other.
coolant smell/leakyes more than likely that's your prob. but could be maybe a hose.
Check coolant level Could be alternator going bad Could be coolant fan going bad
the radiator itself no but the coolant that it carries has distinct odor Any paint on the new part could smell.
there could be a dead animal in your vent
if you smell coolant and your windows are fogged possibly it could be the heater core.
TCP
The head gasket sits between the head and the engine block if it is leaking out where you can see the coolant, yes you can smell the coolant if it is leaking into the engine no you cannot smell the coolant. You can check the oil to see if it has coolant in the oil if it does then the head gasket might be blown.
The smell is not dangerous - however, if there is still a smell, there could still be urine, which could cause diseases and infections if you come in contact with it.
if your asking about your air conditioning, it could be your refrigerant, but a smell that would more closely resemble vinegar would probably be your coolant