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[Entwood]

Try changing the header tank cap !!! 

If its hissing its leaking ... if its leaking its losing pressure, .... if its losing pressure the water is boiling off early.

The whole purpose of a pressurised system is to change the temperature at which the water boils.

[Darth Loo-knee]

Try changing the header tank cap !!! 

If its hissing its leaking ... if its leaking its losing pressure, .... if its losing pressure the water is boiling off early.

The whole purpose of a pressurised system is to change the temperature at which the water boils.

I have just read through the whole thread again and was going to say the same thing Nige

[shell]

thanks again folks..i know its hard to deal with some one with as little car know how as me!.
Entwood..i noticed if i push it down very gently it stops hissing..and i had wondered if it had lost its washer or somesuch..i thought maybe id dropped it when checking sometime.(there isnt a washer is there?)But as you say it is losing pressure from a failry low temp.Also the water seems to expand in volume till the tank is full.I never noticed this before..
sorry again for dragging it out
thanks mate
shell x

[shell]

REREAD..sorry...should i replace the tank stopper...(oops blonde!) the yellow thing.? it cant do anyharm and is a good first stop?

[Darth Loo-knee]

There should be a rubber washer that goes around the edge inside at the top of the thread

[Darth Loo-knee]

REREAD..sorry...should i replace the tank stopper...(oops blonde!) the yellow thing.? it cant do anyharm and is a good first stop?

They are around £15 from Vauxhall would be a cheaper way to start.

[Darth Loo-knee]

If your losing no water, aint got any water in the oil, not spitting water like a fountain out of the exhaust I wouldn't say it was the head gasket. He says sticking his neck out 

[shell]

Thanks!!!!!!!!!!!!!!!!!!OK..THANKS.i wouldnt be surprised if i had lost that washer cos i dont think its there now!(just the yellow cap but NO washer)ive looked in that tank so many times in the last month that it stands to reason that ive lost it!..and that would explain the hissing,,,and might also explain the daft cow!embarrassed and very gratefull for a first option not involving hgs...
thanks im going to get one tommorrow
this forum is amazing..you guys are great!
shell x

[Darth Loo-knee]

Don't drink all your Scots Firewater save some for next Thurday 

[shell]

Well, i went to vauxhall parts today and got a new cap.Hey presto after the temp hit 95 no hissing!..2mins later i noticed a small crack had appeared just below the thread .Very subtle hissing now coming from that.I was SO carefull not to let temp go above 95 and the first fan hadnt even kicked in yet.It def wasnt there this morning.Oh i aslo put holts speed flush again(couldnt find forte).
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shell x

[Entwood]

New header tank then ...   Not too expensive I believe ... but  a lot lot cheaper than a head gasket change !!! 

[shell]

 thanks Entwood! but stop saying headgasket!lol
Surely must have been alot of pressure to crack that?The guage didnt even show 95 is i said earlier,anyways still overheating badly i think, should i think about the thermostat?
cheers
shell x

[Darth Loo-knee]

Like Entwood has said put a new reservoir on, should be around £30 I think.
You never know what Monkey has had the car before or done the repairs

[Entwood]

Cracks at the filler neck can be caused by simply overtightening over a long period. The stress would get worses as the pressure builds. The cap only needs to be on firmly, NOT tightly.

Once the crack starts to form any further overtightening just makes it worse.

The crack leaking has the same effect as the cap leaking, loss of pressure = overheating = loss of fluid

[shell]

Thanks mate, ill look into that. back to vauxhall tomorrow.Is that likely to just happen again with the new one? Do i need to get to a garage before i do some damage ?