First, Is there actually coolant in the over flow tank?
If the bottle is full the coolant level sensor may be bad. The sensor pulls out the bottom of the overflow reservior.
If the bottle gets low overnight there is a leak. Check the radiator side tanks for leaks. You need to look from underneath the car at the joint where the radiator meets the black tanks on the left and right sides.
You also need to look from underneath for most of the other hoses on the car, the car is turbo most likely and there are hoses that go to and from the turbos, into the cabin, and to and from the engine.
Leaks are hard to find from just looking from the top of the engine.
Hope this helps.
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i have changed the radiator. Cheked the oil if there is watter in it. the watter is just vanishing what is happening there are no water leakes.
How long has the coolant level been going down since the radiator has been replaced? Is there an odor inside the car? Is it a turbo?
On what side is the drain on my 2000 s80t6 Volvo
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