Engine knocking can be caused by numerous things. Having the incorrect spark plugs, carbon deposits on the cylinder walls, and being low on engine oil may all cause a knocking sound.
I bought a used 2003 avalanche and the soeakers have no sound. Radio works and has power but no sound. They seem to be connected (speakers) so is there a fuse maybe
your ac compressor could be seizing up. happened on my 2003 suburban.
No.
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