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Compressor is unbalanced as the rpm's drop.

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Q: Why does central air make a knocking noise when it turns off?
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Why does my 1993 Honda Civic make a loud knocking noise from the front passenger side when making turns?

Might be a bad cv joint


Can a bad harmonic balancer make a knocking noise?

A bad harmonic balancer can cause a knocking noise. The harmonic balancer doesn't actually produce the noise, but it can cause the noise in the engine.


What causes a knocking sound in your car?

many many things, Loose lug nuts which lets wheel make knocking noise. Engine will make a knocking noise if it is really low on oil. Some timing belts make a knocking, slapping noise just before they break.These are just a few examples . Have someone ride in car with you as you duplcate the noise and see if they can determine which part of the vehicle it is coming from.


I have a citroen xsara Picasso and it has started to make a knocking noise from the wheel when the car turns left or right. Has anyone else had the same problem?

anti roll bar


What would cause a loud knocking noise coming from the engine at 70 mph and make the truck shake very badly?

Having a bad rod bearing could cause a truck to make a loud knocking noise and shake when driving at high speeds. The engine having a coolant leak or an engine timing problem could also cause the knocking noise.


Why does your 2005 mountaineer make a knocking noise after you hit bumps or turn the wheel?

wierd


Why does a car make a knocking sound when it turns left?

Bad ball joint


Why would your car make a knocking noise when turning?

your cv boot has torn and needs replacement


What would make a knocking noise on your Honda crv sounds like its the front left?

A knocking/clicking noise when making a turn is a sign of a torn CV boot. In this case it's the driver side boot that is torn.


Why would the engine of a 1997 Chevy Cavalier make a loud knocking noise even after being told that there is nothing wrong with it?

it's probably a rod knocking


If a rear axle is bent will it make a knocking noise while driving the car?

The knocking that you are describing reminds me of a stuck universal joint. A bent axle usually wears tires out very fast more than making noise.


Why does a 1996 dodge stratus make a knocking noise when in reverse?

Where is the noise coming from? If its from the fenders or wheels is a much different problem than if its coming from the transaxle.