Have it chemically tested-Could be a warped or crack head/block and a failed water pump

I took the cylinder head 2 the engineers and it passed they said no cracks plus it was skimmed but what it does is when I park it and switch it off 4 a few minutes....all the water in the resivour goes down and I must fill it up again be 4 I go...the water pump still works coz the water is circulating

How does your engine oil look and radiator cap any good? not sure pressure test it or replace and see what happens

It looks normal it ddnt mix...what shud .I think I shud take the radiators out coz I put engine coolant and it spit it out the resivour and heated

Have the radiator checked if its clogged-up,