I hate to think. Call a technician.
There are a number of reasons why air coming up from air vents would smell like dead fish. The air ducts may need cleaning. The air coil may need replacing. It could even be an electrical problem with the unit.
1. No heat coming out of the defrost duct or wrong heat selection position. 2. fresh air intake blocked or dash switch in the recirculating air position. 3. Heater core is bad if there is an antifreeze smell in the car or antifreeze is coming out the heater lower ducts or on the floor. 4. If car is equipped with internal heat control valve, the valve may be leaking.
A smell coming from a reverse cycle air conditioner may be a signal that the filter needs to be cleaned. A smell like engine exhaust might be present if the air conditioner motor is in need of repair.
is your fan running in the correct direction? are any of your ducts blocked?
we can smell the gas like if there is a candle which is lit when we will blow we can smell the smell of the coming out pf it
Have the cabin air filter changed.
It means your healthy and it does it to keep nipple ducts open to let air in
Aroma
no you would just get more air to the rooms that you use
The change in humidity in the air before a rainstorm can sometimes cause a change to the smell of the air but not for all rain showers and not everyone will notice these changes.
Return ducts are under less pressure, but they need to move the same amount of air, so they must be larger.
sounds like your air conditioner compressor is bad.