Antifreeze bleed screw?

[Jcerb]

Where is this located? When the hot water valve was changed the mechanic couldn't find it and I just want to make sure there is no air in the system, what's the best proceedure to do this? Many Thanks.

[Adrian W]

I didn't know it had one, I just jack up the back, take the pressure cap off and leave it overnight

[StreetDragster]

If you have access to a compressor a vacuum purge kit is brilliant for cars like ours with long coolant runs.

I've not seen a coolant air bleed point on the Noble either

Matt

[Ian Perry]

When I had mine serviced at Jetstream and a new upgraded radiator fitted ,Dave did remark that they don't suffer from air locks that much and I am sure he left a front hose loose to purge the system on refill and initial running .

I have to say I have not topped the coolant up since so all good ,I had a 911 prior to this and like the Noble rads are along way from the engine and that was an absolute nightmare to purge.

[verba1]

the level on my pro alloy header tank seems to go up and down like a donkey's d**k is that due to air in the system and it leaks from the overflow pipe ( i presume that can be solved with the stant pressure cap )

[Davie M12]

verba1 said:

the level on my pro alloy header tank seems to go up and down like a donkey's d**k is that due to air in the system and it leaks from the overflow pipe ( i presume that can be solved with the stant pressure cap )

Mine leaked too until I upgraded the cap to the Stant cap.
Level should always be half way up the sight glass when cold, when running it is usually well above the sight glass.

[verba1]

So i fill it up to half on the sight glass and use the the car , then come back to the car after a few days and it's still well above the sight glass. Then drive it again and then after a few days it's right down below the sight glass . ( no leaks on visible pipes ) cant't work it out ?

(apologies to JCERB for the mini hijack)