I just had this on my skoda fabia 1.2 , I found that it was the Outer c/v joints on the drive shaft , this is easily repaired as you can get the whole c/v joint kits from about £25 each from somewhere like euro car parts etc. Or it might be just a split in the c/v joint boot whitch can easily be replaced and packed with grease again costing less than a whole joint . Jay
Might be a bad cv joint
anti roll bar
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.
Bad ball joint
what is the problem when you are making turns you get a cracking noise.
I had a problem similar to this in my '93. I took the wheel off, and looked at the shield on the engine side of the brake rotor. Turns out, it had gotten bent and was rubbing against the brake rotor and sounded like it was knocking at low speeds. Just get some needle noise pliers, a rag, and a hammer, and gently try and bend the shield back. Use the rag under the hammer so you don't dent up the shield.
Spare
AnswerNoises have to be heard to correctly diagnoise. TAke it to a garage. But a good place to look for a noise when the driveline is under torque ( accel and turning) would be the CV axles.
Turns down the quiet bits
Possible wheel bearing, see if noise changes on left & right turns.
The furnace is loud when it turns on because the ignition of the burners and the movement of air through the system create noise.
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.