Expansion Tank Top Hose

[martyn]

I've recently refilled the coolant in my Sigma and just want to double check everything is ok..

With the engine running, there is coolant continuously flowing from the top expansion tank hose. Is this normal? I've never noticed it before and assumed this was a bleed pipe removing air from the radiator.

On a related note (and I suspect the answer to the above has something to do with this)...  My sigma radiator doesn't have a bleed screw.  Does it need bleeding or is it 'self bleeding'?

For reference here is a picture of an identical setup to mine..

 

http://i260.photobucket.com/albums/ii19/320bimmerman/GARAGE/Caterham/IMG_5102.jpg

[Jim 123]

My Sigma has a constant flow into the expansion bottle which I thought unusual, but Caterham tell me it's normal.  I'm in the process of my build, and on my car there is no small T piece to the radiator, simply a straight feed from the back of the head into the top of the expansion bottle.  However I do have a bleed screw at the top of the radiator, and got a little air out of this after my first run up.

[RedCat7]

Mine does that.  The old plastic tanked radiator has the extra nipple for self bleeding.

Shame they didn't keep that feature for the newer alloy tanked radiator as it has caused me and others problems with air locks in the radiator.  http://www.lotus7.club/forum/techtalk/150-sigma-expansion-tank

[martyn]

Mine does that

Do you mean you have a continuous coolant flow from the small top hose?

If I understand your linked post, you've used a banjo bolt into the bleed port to achieve the same setup that I already have?  Giving yourself the same 'self bleeding' convenience?

[RedCat7]

Yep and yep.