If it is a thumping and a front wheel drive car, it is probably one of the axles.
The loud noise from the AC when turning off is often caused by the sudden release of built-up pressure in the system as the compressor shuts down. This pressure release can create a loud "whooshing" or "popping" sound.
Why should I know?
When an air conditioner makes a loud noise when turning off, it could be due to the sudden release of built-up pressure in the system. This can cause components to vibrate or move, creating the noise. Regular maintenance and checking for loose parts can help reduce the noise.
ball joint or tierod end
Your furnace may make a loud noise when turning 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.
If the sound is a loud growling , whining, noise you're probably low on power steering fluid. Now the cause of the fluids loss is WHERE ?
When an AC unit makes a loud noise when turning off, it could be due to the sudden release of built-up pressure in the system, causing vibrations and rattling. This noise is often normal and not a cause for concern, but if it persists or gets louder, it may indicate a problem that needs to be addressed by a professional technician.
Power Steering Fluid Low.
Could be a wheel bearing
Loud and sustained or repetitive noise.
A noise that is 55 decibels loud is considered moderate in volume.
roar really loud noise