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[Elite_L0ver]

Its hard to say Paul .... the cap will increase the pressure in the system and therefore raise the boiling point .... but under no pressure yours is not reaching boiling point, so, in theory, the cap should make little difference.

The "thermal siphon" within an engine works best at zero pressure, and yours seems to be doing just that .. controlling nicely with the cap off.

It is when you put the cap ON that problems start ....

So ... a small increase in pressure is leading to a large increase in pressure sufficient to cause changes in water level and pressure leakage ..

possibilities to my mind ....

Stat stuck shut, small pressure rise causes thermal siphon to cease, leading to localized "boiling" at the engine block, resulting in steam causing a large pressure rise and water displacement, as well as the block temperature rise you see.

perhaps all those could also be caused by the waterpump not moving water within the system ??
Not sure TBH

When was WP changed last cambelt change is any noises coming from belts knocks squeals etc

[PAULCDX]

To be honest yes there is, I have noticed some squeals what sound like they are coming from the belts / tensioners and after about ten mins it all goes quiet....... Then on tick over you here a slight squeak every now and then but I have no idea where it is coming from

Could this be something then?

previous owner had the water pump and belt last changed in 2008 at 45k, car now on 75k.......

[martin42]

never go buy mileage or age,a part can fail at any time

[PAULCDX]

Agreed Martin, I've got all the parts here ready to be fitted along with other jobs lol,

So could the noise from the belts / tensioners area be related to the water pump failing? Maybe this is my fault?

[JamesV6CDX]

This one is now fixed. The new stat was fine and not to blame.

Repair cost total of £3 from Hellfrauds and took 30 seconds to fit if that helps narrow it down    Now runs lovely up to temp, no leaks or over pressuring and good cabin temp. Top hose holding from cold test shows stat opens as designed.

Happy days  

[aaronjb]

Jubilee clip?

[omega3000]

This one is now fixed. The new stat was fine and not to blame.

Repair cost total of £3 from Hellfrauds and took 30 seconds to fit if that helps narrow it down    Now runs lovely up to temp, no leaks or over pressuring and good cabin temp. Top hose holding from cold test shows stat opens as designed.

Happy days

What was the £3 fix that solved it 

[JamesV6CDX]

new header tank cap/seal.

The seal on the old cap was, er, non existant

Replaced, and now behaving perfectly

[PAULCDX]

Can't believe I failed to notice the cap seal was no good, just proves I'm useless and have no clue with cars 

Cheers James 

[JamesV6CDX]

Just glad it was a straightforward fix for you mate to get you mobile