Heat temperature evaporates water, therefore the water level will decrease on a more than daily basis as the vehicle is used. This is just one of the reasons for water loss (or usage). The radiotor drain plug migh be loose or worn. the plug is a white plastic like bolt on the base side of the radiator. Some hoses may be loose, worn or broken. the radiator itself may have a leak somewhere within the accordions. pour in some radiator stop leak.
also try coolant instead of water; coolant has a less evaporative density than water.
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check sump oil color
If grey that is coolant into the sump , probably from behind the water pump impeller
because water loss is not evident the fact that there is loss means that there is a leak some where
There is a drain hole under the water pump housing and if the seal is gone the water will leak out there under pressure and when operating and the coolant is lost in the air stream
Take it to an accredited radiator shop and have the system pressure tested
the water can get into the sump oil from pin holes in the timing case behind the water pump impeller
if you have water in the sump oil it will be a dirty grey color and the filler cap will have water droplets under it
If the oil is normal color then the loss could be from rusted welsh plugs
pressure test the cooling system to check for leaks
take it to a radiator shop and have the system pressure tested
if the pressure remains static at pressure start the engine and see if the pressure drops
if it does indicates a water pump seal when running
check the drain hole under the pump housing for stains and water marks
something the garage should have done
Mr. BEY the problem you have with your car is as follows: as I believe the loss of power drops soon after the the temperature risen. If is like that then check your water circulation. First remove your thermostat and by leaving it without thermostat start the engine after you put water in radiator and rev it at approximately 1500-2000 revs and follow the water circulation as you have the radiator cap off. If the water circulates according to rev then the problem is not on the water pump. If the water does not circulated then the water pump even is not leaking or is not noisy, the propeller inside is broken due to corrosion and you have to change it after you remove the timing belt and renew everything.Also after you check for the water circulation and is none of the above,Put the radiator cap on and drive it in some distance following the temperature and the power of your car. If there is no problem then surely you have a problem with your thermostat and you have to change it. Remember anything you do by renewing anything put the recommended coolant and bleed the system . Also I do not know the condition of your coolant and how often you do service, I recommend to check also your radiator if is working ok and is not full or part blogged. If is none of the above and the high temperature comes after driving and the loss of power is first,Check your exhaust blowing whether you have any buffer box blogged.
you should have the cooling system pressure tested and inspected for a leak that may only show up under pressure.it could be a slow leak from the water pump,frost plug,head gasket which wouldn`t show up in the oil,heater core.it sounds like a small leak but this is the best way to start to find it.
could be the water pump itself. i"ve seen pressure tests hold and when pressure is down the seals in the pump leak. if you can see the pump, look closely and see if it slightly misaligned. if it is the pump is bad
Check your engine oil to see if it is foamy or looks cloudy not clear, if so it could be a head gasket leak, If not it could be a leaky radiator cap or a leak somewhere else in the cooling system. If you see no leaks and are losing water it could be a leak inside the engine, this would show up in your oil
Has your check engine light turned on....and is still on? if no light is on its a leak on your radiator or as simple as the radiator drainer loose. those radiators are made of plastic and are not made to last! good luck!