You'd need to identify what is consuming space in /tmp before anyone would be able to tell you how to resolve the issue. The following threads have some further info in them as well as links to further information on the issue:
forums.cpanel.net
forums.cpanel.net
/tmp & /var/tmp usage warnings during large file upload
Hello, I have a cpanel sever we use with owncloud. We are getting disk usage warnings when trying to upload large files in owncloud for the /tmp folder and /var/tmp. Used: 3.33 GB Available: 289.18 MB Total: 3.81 GB We do not see this with files smaller than the /tmp folder partition...
DISKWARN blocks ⚠: Mount Point “/var/tmp” (IP): 6.48 GB/7.75 GB - 88.994316%
Hello. I need help, the partition / var/tmp is about to fill > attached image
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