Mystery water disappearance

[Zoff01]

Coolant level keeps dropping...New cap ...still dropping...Pressure tessted, no signs of leaks or water stains...any suggestions before I buy a new coolant bottle. Thanks

 

[tode]

Damaged radiator ?

 

[zipdip]

Well have you had a look at the engine oil.

 

[slade1]

Pressure test when engine is at running temperature?

 

[ioweddie]

plastic water pump failure common fault

 

[Petrol Pete]

Very small leak when engine hot but tint coolant leak gets evaporated by hot engine component so does not actually show up as a liquid under the car.

Had exactly this on a non MB car , it showed itself during an MOT when the engine was running during the test, small whisp of steam spotted coming from a tiny leak dripping on to hot components.

 

[Zoff01]

Damaged radiator ?

Not checked this, but I will get it looked at asap. The temp does not change though, constant at all times. Thank you

 

[Zoff01]

Well have you had a look at the engine oil.

Hi I had the engine oil checked and it was fine. I will keep and eye on it, running temp or cold ? Thank you

 

[Zoff01]

Pressure test when engine is at running temperature?

Hi , i arrived the garage 10 mile drive there and straight into the bay, and he waited for a while to open cap as engine was at running temp. Thank you

 

[Zoff01]

plastic water pump failure common fault

I did buy a new one, and someone suggested maybe the cap was faulty, so sent it back.....I have now ordered and new one. Thank you

 

[Zoff01]

Very small leak when engine hot but tint coolant leak gets evaporated by hot engine component so does not actually show up as a liquid under the car.

Had exactly this on a non MB car , it showed itself during an MOT when the engine was running during the test, small whisp of steam spotted coming from a tiny leak dripping on to hot components.

I will have someone have a look as you mentioned. As said nothing visible re water, no staining or crystallisation of water. Thank you