OK, earlier I removed the stat. Put it in a pan of boiling water, and it opened about 2mm, but only after a few minutes at a rolling boil.
I take that to mean it's had it, as according to BMW it should open at 85 degrees.
So anyways I cut the centre out of it (the outer ring supported the rubber seal) and refitted it. Refilled the water and ran it. After manipulating the rad hoses to make sure there were no airlocks, the rad got nice and hot, and no more boiling up.
So well done guys - stuck stat it was! Now I just have to find a replacement at a decent price.
|