Sharepoint server search

Hi Team,

We have sharepoint 2010 applications.

 We have recently added 4 new server (windows sever 2012) to the farm and removed the old 4 server(windows server 2008) from the farm. 

Once we removed old server in the farm the search full crawl in the content source is not working. 

it is showing below error.

The SharePoint item being crawled returned an error when requesting data from the web service. ( Error from SharePoint site: *** Could not find a part of the path

c:\users\*\appdata\local\temp\gthsrv_search14\*.tmp).

Please note the user profile service connection got deleted when we remove the server from the Farm.  I suspect that, that could be causing the issue in the search Full crawl issue.

Please note incremental crawl is working But Full crawl is not working. 

Please send your suggestions on this.

Any small suggestions also helps.

Any possible suggestions are appreciated.