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.
Dust coming out of air vents is usually caused by a buildup of dust and debris in the air ducts. When the HVAC system is turned on, the air pushes the dust out through the vents. Regular cleaning and maintenance of the air ducts can help prevent this issue.
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?
Have the cabin air filter changed.
Aroma
It means your healthy and it does it to keep nipple ducts open to let air in
There may be too much air coming out of the vent due to a blockage in the air ducts, a malfunctioning blower motor, or an issue with the thermostat settings. It is important to check these components to determine the cause of the excessive airflow.
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.
The smell in the air that you are noticing is likely coming from something nearby, such as food cooking, a nearby factory, or natural sources like plants or animals.
sounds like your air conditioner compressor is bad.