I had 2 blogs on my domain. This exipred as I was away on holiday, now the site is offline. domain - Namecheap. if I reactivate the domain, will the offline blogs reappear? {as they are still hosted on the hosting account} -but the domain is expired. or will I have to reinstall the blogs + Blog posts?
No need of reinstall your Blog posts , Blog posts are safe in your blog.You can view your Blog by enter your Blog URL or Login to Blogger and Post new Posts. If your Domain is expired and available anyone then you need to Set the settings once more on your DNS. No need of work in Blogger . If it Just expired and waiting for your Reactivation then Go and Reactivate, No need to Worry.Website is there without nay change.
Once you renew the domain name, the site will come back online, as long as the nameservers haven't been changed.