Well - since my bloomin drain in the bulkhead blocked last few weeks water got into the blower motor and has since started squeaking. Last week been AWFULL on all speeds.
So yesterday I removed the blower motor unit, split the motor out from the plastic casing and re-greased the bottom (that had bad water marks) with molly grease (used for hi temp hi speed bearings to shouldnt dry again) and re-assembled.
Result - complete silence! no squeals or cherps!!.. the main motor shaft had also dropped so a few taps with a hammer later and there was no play in the shaft anymore..
thats saved me a few £££
ps. Happy new year all..