Here are some key points about neuropathy. More detail and supporting information is in the main article. 1  Neuropathy is a common condition. 2  Neuropathy is a complication of a number of different medical conditions. 3  Three types of nerve can be involved; autonomic nerves, motor nerves and sensory nerves. 4  Sometimes single nerves, or nerve sets are affected.
If you never remove the scale from a water heater tank the clanking or cracking noise heard at the water heater during operation may eventually cease when the scale solidifies, no longer trapping hot water and interfering with its movement upwards in the water tank.
Any gurgling sound would be coming from the cooling system. What you are hearing is the coolant boiling back into the radiator. It boils due to a change in pressure in the system. The coolant expands back into the radiator, boils, and makes the sound as vapor escapes up the radiator paths.