Repair done as presented. The fan connection was a little tricky to get out but apart from that non eventful. New fan working nicely.
The HDD of my iMac crashed & needed to get it to a data recovery service. They said they only took the drives. A work colleague advised this site saying their instructions were straight forward & gave realistic expectations. I was surprised to find the tools required at my local hardware store. The steps were straight forward and I now have my data recovered. Thank you.