Squeaking from A/C

[Nik]

Hey guys,

I have done some searching, but couldn't find any nessary info on this. I have previously been hearing some squeaky noises, they whould get strong, or dissapear from time to time... Today I noticed that they are precent only when I turn on heat. sound was kind of coming from steering wheel, but now It's for sure some heating related.
Could water pump be the problem here? Does additional power go through it when A/C is on? It's an M62 4.4.
My fan has one wing off, causes unnessary vibrations (sadly can't find one anywhere) as I have 3 leg clutch, and at stealers only have 4 legged Clutch and it's 300$ for clutch and 60 for fan itself.
also when I turn key to pos 2, some knocking sound comes with it, and disappears momentaly.
Also, V belt is new, has 3k miles on it. and A/C belt is not on yet, as I bought wrong one, then exchanged it ro right, but mechanic told me that it's only nessary when I use it on summer, so he would put it when I bring the fan to him... Lazy guy