water

[nathan]

can any tell me should water rise and fall in the header tank???????:roll: :roll:

 

[PobodY]

Because it expands with heat and contracts with cold (or rather 'without heat').
Sounds like your radiator cap is on the way out and it's not holding pressure.

 

[nathan]

its had a new cap and water pump

 

[nathan]

what pressure rad cap should be on it

 

[geoff pine]

What do you mean by rise and fall ? it should be at the minimum level when its cold and no more than max when hot then back to minimum when it cools down.

 

[nathan]

thats roughly what it is

 

[PobodY]

Then it works and it's just the natural thermal expansion of water you're observing.

Do you want the chemistry behind it, was that actually your question?

 

[nathan]

no m8 i was just checking that it should go up and down