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[plym ian]

is that a sure sign of hg failure and also water loss(no visable signs of leak) and temp rising and falling. if so I'm going to be busy the next day or so

2.0 pfl if that helps

also do I have to replace head bolts what would happen if I didn't replace them?

[dazzerM]

It could be something as simple as an airlock, similar symptoms...

Out of interest have you changed/flushed the coolant recently 

[Webby the Bear]

Shouldn't you do a leak down test to confirm it's the HG?

[dbug]

If you can smell exhaust fumes in your expansion tank, a compression test would confirm hg failure

[Gaffers]

When you torque the bolts they stretch so if you reuse the old ones you are asking for trouble.

Plenty of tests you can do to confirm, a cold and warm leak-down test is a good start.  On the 2.0 a HG repair is pretty easy and can be done in a day (providing the head doesn't need a little skim)

[plym ian]

right went out to have a look today filled the expansion tank up and within 20mins on tick over it was almost empty no visable signs of a leak anywhere and I have a grey blue smoke from exhaust. I only changed hg less than 2 years ago but all signs lead to hg

[Gaffers]

Is there more moisture coming from the exhaust than usual? If so with the blue smoke coming from the exhaust I would suspect the HG. 

[plym ian]

Is there more moisture coming from the exhaust than usual? If so with the blue smoke coming from the exhaust I would suspect the HG.

yes there is a small amount of water on floor