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Probably due to an airlock in the cold water system (feed pipe).
It could be a number of issues ..... blocked matrix (behind dash) An airlock in the water system, A leaky head gasket, A seized thermostat
By drip and sprinkler system
By shutting off the water supply and replacing the valve
An airlock is a device which permits the passage of people and objects between a pressure vessel and its surroundings while minimizing the change of pressure in the vessel and loss of air from it.
In area where water supply is poor during periods of peak demand what type of system would usually be specified for the domestic dwelling?
A drainage system for carrying surface water and sewage for disposal.
secondary cold water system
Are you asking about HEATING H/ W or domestic?
Liquid sodium
It is always better to use a water antifreeze mix because of the corrosion inhibitors in the anti freeze. Check that the cooling system hasn't got an airlock after changing the thermostat, make sure thermostat isn't upside down. Often get an airlock in the heating part of the water system, there should be a bleed screw in the engine compartment between the engine and the heater unit. Air locks are a common problem when refilling the cooling system and will lead to overheating as prevents proper circulation.
Water comes from your city system through a watermain, or on many rural homes from your domestic well.