zafira 1.6 water bottle keeps going empty but can't find any water leak
I would top it back up and prepare to get.comfortable. start the car and watch to see if coolant is leaking out.
If you can see anything it could be heater matrix , so look out for wet carpets or if it's leaking internally. Ideal you could do with a pressure test before thinking headhasket if you can see it leaking out once topped back up.
Leak at radiator / radiator bleed screw for leaks.
Expansion bottle - check for hair line cracks.
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