Hi my wife's mini had a warning light come on a few days ago, she stopped immediately and had the AA out, they pressure tested the expansion tank and it was hissing/p1ssing water from the central joint, I understand this is a common failure and have ordered an ally header tank to replace the plastic piece of poo.
He also checked the oil and it was very low, I have hunted it down to what I believe is a leaking crank sensor seal (see my other post about this), my question is, are the two related? Would the low oil have caused the engine to get hot and boil up the water? Or is it likely to be something different and just happen to have come at same time?
What would you advise I check re the water, or is it just likely to be the split tank that has caused the overheating.
Normally I love chicken and I love eggs, but when it's a case of chicken or egg problems I am not so keen
Thanks in advance for any info you can provide.