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[omega3000]

So im back to sqaure one after replacement of :

Radiator
HBV
Thermostat
Bridge seals ect ect

The car will gradually heat up and up till it goes into the red after 10-15 miles . When i pop the bonnet i can hear slight hissing from the back of the engine so could this be the non vx HBV at fault but i must add that there are no coolant leaks anywhere .

Im beginning to give up hope on keeping the car at this rate as much as i like it , any help appreciated even in person from anyone on here that can solve this for me .

Many thanks .

[HockeyDave55]

I was getting this a while ago.... Try parking with the car facing uphill, put your heating on hi and pull the hose on the throttle body.
You might have an air block and this is the highest point so give that a try and top the girl up!
Hope that helps 

[doz]

Water pump maybe?

[Entwood]

Check header tank cap/neck .. a leak from either small cracks in the neck or a knackered cap seal can give similar symptoms

[omega3000]

I was getting this a while ago.... Try parking with the car facing uphill, put your heating on hi and pull the hose on the throttle body.
You might have an air block and this is the highest point so give that a try and top the girl up!
Hope that helps 

Thats about the only thing i have not tried dave but ill give it a go 

Header tank is pressurising like there's too much air in the system and it has poured out water once when its overheated 

[Entwood]

I was getting this a while ago.... Try parking with the car facing uphill, put your heating on hi and pull the hose on the throttle body.
You might have an air block and this is the highest point so give that a try and top the girl up!
Hope that helps 

Thats about the only thing i have not tried dave but ill give it a go 

Header tank is pressurising like there's too much air in the system and it has poured out water once when its overheated 

If it's leaking water from the cap then the cap is leaking .....  !!!  have a read here ..especially the solution right at the end !!!

http://www.omegaowners.com/forum/index.php?topic=101140.0

Also read this post

http://www.omegaowners.com/forum/index.php?topic=101516.0

Then check your header tank cap and neck ....   

[flyer 0712]

Hi   i have found in the past with air locks that i put the car up on car ramps or jack up the front as high as possible..with engine running..rad cap off this causes the air to dispel .

[omega3000]

Is it normal for the water to start spewing out the bottle with the cap off ?

I was getting this a while ago.... Try parking with the car facing uphill, put your heating on hi and pull the hose on the throttle body.
You might have an air block and this is the highest point so give that a try and top the girl up!
Hope that helps 

I have just tried this and its still overheating 

So its either header tank or cap now then or worse still the core plug !! If it was the core plug wouldnt the car be losing water rapidly as ive seen no water loss/leaks at all 

[HockeyDave55]

I think you have an air lock.... Maybe???
Actually, that's exactly what mine was doing 'til I got all the air out...

[omega3000]

I think you have an air lock.... Maybe???

I really dont know what to do now dave , done as much as i can to resolve this but it still keeps overheating .

[HockeyDave55]

See edit above....

[doz]

Have you felt the radiator? Is it getting hot?

[omega3000]

Have you felt the radiator? Is it getting hot?

Yes the rad is getting hot doz 

The temp needle falls when its revved 

But when its driven it will just overheat .

[HockeyDave55]

I have read the head gasket rarely go, and IMO, if it was a core plug, you'd get water elsewhere....
Lift the front of the car, I don't think it needs much??? Open the header tank and loosen the small pipe on the TB but leave it on.
Run the engine and pull the small pipe, some water will come out but I think air will too.....
Keep topping up the tank and soon you should expel all the air....

[HockeyDave55]

Air lock!