Question about 1990 Nissan Sentra
Losing water such that you add 2litres daily
If you say no traces that tells me that you have most likely checked out your radiator well for no leaks. 2) You can loose water via the water pump.You can move or turn the pump by hand and if it gives or fills loose in anyway then the bearings are bad in the pump.3) Check your thermostat.The number one reason for a problem such as yours. If it sticks your motor will turn water into steam and you loose it that way. These are the only ways one can loose that much water on a daily basis.
Good Luck, Phil
Posted on Jan 06, 2009
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Posted on Jan 02, 2017
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It appears that you have a minor leak at where a hose attaches to an engine or radiator pipe. When the engine is hot, any small leak will evaporate quickly and therefore not be seen. As the coolant heats up it will expand into the overflow tank but once the engine is stopped the extra heat build up will force the coolant out the leaking joint. As the engine cools, the leak prevents the coolant from being sucked back from the overflow tank.
Check all hoses and clamps including heater hoses and those pesky little bypass hoses in the cooling system for a good tight fit and replace any hoses that have gone hard or have become soft and stretched. Those spring type hose clamps tend to be less effective in clamping as the hoses age. Worm drive ones are the best to use.
If unsure take vehicle to a cooling system specialist and have them do a pressure test and more thorough diagnosis.
If problem persists, then it could indicate a problem with the head gasket (Usually caused by allowing engine to become excessively overheated when cooling system has run dry) allowing very hot high pressure combustion gases into the engine water jacket, which super heats the coolant in the engine block, which then boils off, and is released via the cap or any leaks. If the head gasket is really bad it will leak water into the cylinders and into the oil in the sump. This is indicated by an emulsion of water and oil mix on the dipstick. You will also see white smoke (water vapour) from the exhaust.
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