Evening guys

So I am having some issues with the water system

I think it may be an air lock 

I fill up the tank and get the car running, after some time the water level drops 

I fill it back up and the process starts again

This happens over and over

There is no sign of a head gasket failure 

No oil / water mix

The water pump sounds ok

I have changed the thermostat

Any ideas 

check all the hoses they maybe a pin hole in them and you can lose a lot of water from them when running😟

How far does the level drop?   It might be finding its natural level.

The header tank is almost empty 

Im not sure if it's an air lock 

Was 1 topic not enough? Lol

 

You may find it is still settling down.May take a little while,as long as you did the basics fill slowly , making sure highest point had coolant in it.Start car heater on , full blast , hot and on screen setting you should be okay...You can also run it stationary with the expansion cap of and see if any bubbles start a popping ie air then level would drop to replace this obviously.

 

If not look for a leak when up to running temp ie under pressure,rad,pipes etc thats when you will see a leak.Oh check carpet is not wet in case leaking from the matrix.

I had the same fault and it was the thermostat sticking