If you are talking about your outside condenser "growling" when it first comes on, it is probably a weak compressor. You might want to add a "hard start" or "kick start" gear to the unit
Your central air conditioner may make a loud noise when it comes on. This is because it may have a leak somewhere in the system.
Your AC may make a loud noise when it turns off due to the sudden change in pressure within the system, causing components to vibrate or move. This noise is typically normal and not a cause for concern unless it is excessively loud or accompanied by other issues.
Your furnace may make a loud noise when it turns on due to issues such as a malfunctioning blower motor, loose components, or a clogged air filter. It is important to have a professional inspect and repair the furnace to prevent further damage.
Loud and sustained or repetitive noise.
Might be a bad cv joint
The knocking noise in central air systems when they turn off can be due to the metal ducts expanding and contracting as the system heats up and cools down. This is a common occurrence and does not necessarily indicate a problem with the system. If the noise is loud or persistent, it could be a sign of loose components that may require professional attention.
the balloons that make noise is called screamers
snore
you can make a loud noisy by screaming or throwing something heavy around
To make a loud noise with paper, you can crumple it up tightly and then quickly unfold it, creating a sharp snapping sound.
Possibly a broken shock or bad stabilizer bushings
make a loud noise.