Quote Originally Posted by jeff turbo View Post
Its the unit that changes the flow of air and heat. I had it go on my ZS180. Haven't got round to fixing it as it didn't worry me too much.
Think you will find it controls water not air.

ZT 260's are different to the V6 ZT in the way distribution works, and I assume the ZS.
Rover 75V8's are different again which is why the "Y"-piece fix doesn't.

David